Muscles And Brachial Plexus - Lab Exam 1

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Brachial Plexus Quizzes & Trivia

Covers the origin, insertion, action and innervation for the muscles of the arm, scapula, superficial back, pectoral. In addition, this quiz covers prominent bone markings of the vertebral column, scapula, sternum, rib & clavicle, radius, ulna, humerus and hand. Provides a review of the shoulder joint and brachial plexus.


Questions and Answers
  • 1. 

    Which of the following branches off of the lateral cord?

    • A.

      Suprascapular Nerve

    • B.

      Lateral Pectoral Nerve

    • C.

      Musculocutaneous Nerve

    • D.

      Long Thoracic Nerve

    Correct Answer
    B. Lateral Pectoral Nerve
    Explanation
    The lateral cord gives rise to the Lateral Pectoral Nerve.

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  • 2. 

    Which of the following nerves branch off of the posterior cord?

    • A.

      Upper Subscapular Nerve

    • B.

      Medial Antebrachial Cutaneous

    • C.

      Suprascapular

    • D.

      Thoracodorsal

    • E.

      Lower Subscapular

    • F.

      Axillary

    • G.

      Nerve to the Subclavius

    Correct Answer(s)
    A. Upper Subscapular Nerve
    D. Thoracodorsal
    E. Lower Subscapular
    Explanation
    The nerves that branch off of the posterior cord are the Upper Subscapular Nerve, Thoracodorsal, and Lower Subscapular.

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  • 3. 

    Which of the following nerves branches off of the C5 root?

    • A.

      Long Thoracic Nerve

    • B.

      Suprascapular Nerve

    • C.

      Lateral Pectoral Nerve

    • D.

      Dorsal Scapular Nerve

    • E.

      A and D

    • F.

      All of the above

    Correct Answer
    E. A and D
    Explanation
    The correct answer is A and D. The long thoracic nerve and the dorsal scapular nerve are the nerves that branch off of the C5 root. The long thoracic nerve innervates the serratus anterior muscle, which helps with protraction and rotation of the scapula. The dorsal scapular nerve innervates the rhomboid muscles, which are responsible for retraction and downward rotation of the scapula. The suprascapular nerve and the lateral pectoral nerve do not branch off of the C5 root.

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  • 4. 

    Which is the correct order for the "break-up" of the brachial plexus?

    • A.

      Trunks, Divisions, Roots, Cords, Terminal Branches

    • B.

      Roots, Trunks, Divisions, Cords, Terminal Branches

    • C.

      Cords, Roots, Divisions, Trunks, Terminal Branches

    Correct Answer
    B. Roots, Trunks, Divisions, Cords, Terminal Branches
    Explanation
    The correct order for the "break-up" of the brachial plexus is Roots, Trunks, Divisions, Cords, Terminal Branches. This is the correct sequence in which the different structures of the brachial plexus branch out from each other. The roots are the initial structures that give rise to the trunks, which then divide into divisions. The divisions further split into cords, and finally, the cords give rise to the terminal branches.

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  • 5. 

    What is the unique feature of the axillary, upper subscapular, thoracodorsal and lower subscapular nerves?

    • A.

      They all branch from C8-T1.

    • B.

      They are all terminal branches of the brachial plexus.

    • C.

      They all branch of the medial cord.

    • D.

      They cannot be traced back to their roots exactly.

    Correct Answer
    D. They cannot be traced back to their roots exactly.
    Explanation
    The unique feature of the axillary, upper subscapular, thoracodorsal, and lower subscapular nerves is that they cannot be traced back to their roots exactly. This means that their origin cannot be precisely determined or identified.

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  • 6. 

    Which of the following nerves does NOT branch off the trunks?

    • A.

      Suprascapular Nerve

    • B.

      Dorsal Scapular Nerve

    • C.

      Nerve to the Subclavius

    Correct Answer
    B. Dorsal Scapular Nerve
    Explanation
    The correct answer is Dorsal Scapular Nerve. The dorsal scapular nerve does not branch off the trunks. The suprascapular nerve and the nerve to the subclavius both branch off the upper trunk of the brachial plexus. The dorsal scapular nerve, on the other hand, arises from the C5 root directly and does not pass through the trunks.

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  • 7. 

    Which of the following are terminal branches of the brachial plexus?

    • A.

      Musculocutaneous Nerve

    • B.

      Median Nerve

    • C.

      Ulnar Nerve

    • D.

      Axillary Nerve

    • E.

      Pectoral Nerve

    • F.

      Radial Nerve

    Correct Answer(s)
    A. Musculocutaneous Nerve
    B. Median Nerve
    C. Ulnar Nerve
    D. Axillary Nerve
    F. Radial Nerve
    Explanation
    The brachial plexus is a network of nerves that originates from the spinal cord in the neck and supplies the upper limb. The terminal branches of the brachial plexus include the musculocutaneous nerve, median nerve, ulnar nerve, axillary nerve, and radial nerve. These nerves innervate different muscles and provide sensory and motor functions to the arm and hand. The pectoral nerve is not a terminal branch of the brachial plexus but is a branch of the medial cord.

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  • 8. 

    The posterior division of the brachial plexus supplies flexor parts of the upper limb.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The posterior division of the brachial plexus actually supplies the extensor parts of the upper limb, not the flexor parts. The flexor parts are supplied by the anterior division. Therefore, the statement is incorrect and the correct answer is False.

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  • 9. 

    The dorsal scapular nerve DOES NOT innervate which of the following muscles?

    • A.

      Levator scapulae

    • B.

      Rhomboid Major and Minor

    • C.

      Subscapularis

    Correct Answer
    C. Subscapularis
    Explanation
    The dorsal scapular nerve innervates the levator scapulae and rhomboid major and minor muscles, but it does not innervate the subscapularis muscle.

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  • 10. 

    The suprascapular nerve innervates which of the following combinations of muscles?

    • A.

      Teres Major and Minor

    • B.

      Rhomboid Major and Minor

    • C.

      Supraspinatus and Infraspinatus

    • D.

      Levator Scapulae and Subscapularis

    Correct Answer
    C. Supraspinatus and Infraspinatus
    Explanation
    The suprascapular nerve innervates the supraspinatus and infraspinatus muscles. This nerve originates from the upper trunk of the brachial plexus and passes through the suprascapular notch to reach the muscles. The supraspinatus muscle is responsible for initiating abduction of the arm at the shoulder joint, while the infraspinatus muscle is involved in the external rotation of the arm.

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  • 11. 

    The Upper Subscapular nerve innervates which of the following muscles?

    • A.

      Subclavius

    • B.

      Subscapularis

    • C.

      Supraspinatus

    Correct Answer
    B. Subscapularis
    Explanation
    The Upper Subscapular nerve innervates the Subscapularis muscle.

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  • 12. 

    The Lower Subscapular nerve innervates all of the following muscles, except

    • A.

      Teres Major

    • B.

      Teres Minor

    • C.

      Subscapularis

    Correct Answer
    B. Teres Minor
    Explanation
    The lower subscapular nerve innervates the teres major and subscapularis muscles, but not the teres minor muscle.

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  • 13. 

    Which of the following muscles are innervated by the Axial nerve?

    • A.

      Teres Major

    • B.

      Teres Minor

    • C.

      Rhomboid Major and Minor

    • D.

      Pectoral Major - Clavicular Head

    • E.

      Deltoids

    Correct Answer(s)
    B. Teres Minor
    E. Deltoids
    Explanation
    The Axial nerve innervates the Teres Minor and Deltoids muscles. The Teres Minor is a small muscle located in the shoulder joint that helps with external rotation of the arm. The Deltoids are the main muscles responsible for shoulder abduction and flexion. Both of these muscles receive their nerve supply from the Axial nerve, which allows for their proper function and movement.

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  • 14. 

    The Lateral Pectoral nerve innervates which of the following?

    • A.

      Pectoralis Major - Sternal Head

    • B.

      Pectoralis Minor

    • C.

      Pectoralis Major - Clavicular Head

    Correct Answer
    C. Pectoralis Major - Clavicular Head
    Explanation
    The Lateral Pectoral nerve innervates the Pectoralis Major - Clavicular Head. This nerve originates from the lateral cord of the brachial plexus and supplies motor fibers to the clavicular head of the Pectoralis Major muscle. The Pectoralis Major - Clavicular Head is responsible for flexion, adduction, and medial rotation of the arm at the shoulder joint.

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  • 15. 

    Which of the following muscles are innervated by the Musculocutaneous nerve?

    • A.

      Coracobrachialis

    • B.

      Biceps Brachii

    • C.

      Triceps Brachii

    • D.

      Skin of the Forearm

    • E.

      Brachialis

    • F.

      Brachioradialis

    Correct Answer(s)
    A. Coracobrachialis
    B. Biceps Brachii
    E. Brachialis
    Explanation
    The Musculocutaneous nerve innervates the Coracobrachialis, Biceps Brachii, and Brachialis muscles. These muscles are located in the anterior compartment of the arm. The Musculocutaneous nerve arises from the lateral cord of the brachial plexus and supplies motor innervation to these muscles, allowing for flexion of the elbow joint. The Triceps Brachii muscle, on the other hand, is innervated by the Radial nerve, while the Brachioradialis muscle is innervated by the Radial nerve and the Skin of the Forearm is innervated by the Median and Ulnar nerves.

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  • 16. 

    The Triceps Brachii, Brachioradialis and Anconeus muscles are innervated by which nerve?

    • A.

      Radial

    • B.

      Medial

    • C.

      Ulnar

    • D.

      Axillary

    Correct Answer
    A. Radial
    Explanation
    The Triceps Brachii, Brachioradialis, and Anconeus muscles are innervated by the Radial nerve. The Radial nerve is responsible for supplying motor innervation to the muscles of the posterior compartment of the arm, including the Triceps Brachii muscle which is responsible for extending the forearm. The Brachioradialis muscle, located in the forearm, is also innervated by the Radial nerve and assists in flexion of the forearm. The Anconeus muscle, which is involved in elbow extension, is also innervated by the Radial nerve.

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  • 17. 

    Which of the following muscles is NOT innervated by the Medial Pectoral nerve?

    • A.

      Pectoralis Major - Clavicular Head

    • B.

      Pectoralis Major - Sternal Head

    • C.

      Pectoralis Minor

    Correct Answer
    A. Pectoralis Major - Clavicular Head
    Explanation
    The Medial Pectoral nerve innervates the Pectoralis Major - Sternal Head and Pectoralis Minor muscles. However, it does not innervate the Pectoralis Major - Clavicular Head muscle.

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  • 18. 

    Identify the correct origin for the middle trapezius.

    • A.

      Ligamentum nuchae

    • B.

      C7-T3 spinous processes

    • C.

      Spine of the scapula

    • D.

      C1-4 transverse processes

    Correct Answer
    B. C7-T3 spinous processes
    Explanation
    The correct origin for the middle trapezius is the C7-T3 spinous processes. The middle trapezius is a muscle located in the upper back, and its origin refers to the point where the muscle attaches to the bone. In this case, it attaches to the spinous processes of the vertebrae C7-T3, which are located in the middle of the back. The other options mentioned, such as ligamentum nuchae, spine of the scapula, and C1-4 transverse processes, are not correct origins for the middle trapezius.

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  • 19. 

    Choose the correct origin/insertion match for the lower trapezius.

    • A.

      O: T4-T12 spinous processes I: Spine of the scapula

    • B.

      O: C5-T10 spinous processes I: Root of the spine of the scapula

    • C.

      O: T2 - T5 spinous processes I: Acromian of the scapula

    • D.

      O: T4 - T12 spinous process I: Root of the spine of the scapula

    Correct Answer
    D. O: T4 - T12 spinous process I: Root of the spine of the scapula
    Explanation
    The lower trapezius muscle originates from the spinous processes of the T4-T12 vertebrae and inserts into the root of the spine of the scapula.

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  • 20. 

    Identify the actions performed by the trapezius muscle which are correctly paired with the part of the trapezius (upper, middle, lower).

    • A.

      Upper - Elevation Lateral (upward) rotation of the scapula

    • B.

      Upper - Elevation Medial (downward) rotation of the scapula

    • C.

      Middle- Adduction (retraction) of the scapula

    • D.

      Middle - Adduction (retraction) of the scapula Depression of the scapula

    • E.

      Lower - Depression of the scapula Lateral (upward) rotation of the scapula

    • F.

      Lower - Elevation of the scapula Medial (downward) rotation of the scapula

    Correct Answer(s)
    A. Upper - Elevation Lateral (upward) rotation of the scapula
    C. Middle- Adduction (retraction) of the scapula
    E. Lower - Depression of the scapula Lateral (upward) rotation of the scapula
    Explanation
    The actions performed by the trapezius muscle are correctly paired with the part of the trapezius. The upper part of the trapezius muscle is responsible for elevation and lateral (upward) rotation of the scapula. The middle part of the trapezius muscle is responsible for adduction (retraction) of the scapula. The lower part of the trapezius muscle is responsible for depression of the scapula and lateral (upward) rotation of the scapula.

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  • 21. 

    Identify the origin for the Levator Scapula.

    • A.

      C1-4 transverse processes

    • B.

      C1 - 7 transverse processes & Ligamentum nuchae

    • C.

      C1 - 7 transverse processes

    • D.

      C2 - 6 transverse processes

    Correct Answer
    A. C1-4 transverse processes
    Explanation
    The Levator Scapula originates from the C1-4 transverse processes.

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  • 22. 

    Identify the correct insertion for the Levator Scapula.

    • A.

      Vertebral border of scapula and spine of scapula

    • B.

      Vertebral border of scapula from superior angle to root of spine

    • C.

      Vertebral border of scapula from superior angle to inferior angle

    • D.

      Axillary border and acromion process

    Correct Answer
    B. Vertebral border of scapula from superior angle to root of spine
    Explanation
    The correct insertion for the Levator Scapula is the vertebral border of the scapula from the superior angle to the root of the spine. This means that the muscle attaches to the inner edge of the scapula, starting from the top corner and extending down to where the spine of the scapula begins. This insertion allows the Levator Scapula muscle to elevate and retract the scapula, helping to rotate and stabilize the shoulder blade.

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  • 23. 

    Correctly identify the actions of the Levator Scapula.

    • A.

      Elevation

    • B.

      Medial (downward) rotation of the scapula

    • C.

      Lateral (downward) rotation of the scapula

    • D.

      Adduction (retraction) of the scapula

    • E.

      Assists in forced exhalation

    Correct Answer(s)
    A. Elevation
    B. Medial (downward) rotation of the scapula
    Explanation
    The Levator Scapula is responsible for two actions: elevation and medial (downward) rotation of the scapula. Elevation refers to the movement of lifting the scapula towards the ears, while medial rotation involves the movement of the scapula rotating downwards towards the spine. These actions are important for various movements of the shoulder and upper back, such as shrugging the shoulders or pulling the shoulder blades towards the spine.

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  • 24. 

    Choose the statement that correctly describes the action of the Rhomboids.

    • A.

      Rhomboid Major and Minor have the same actions: Adduction (retraction) of the scapula & Medial (downward) rotation

    • B.

      Rhomboid Major and Minor have the same actions: Adduction (retraction) of the scapula, Lateral (downward) rotation and Elevation

    • C.

      Rhomboid Major performs Adduction (retratction), while Rhomboid Minor performs Medial (downward) rotation

    • D.

      Rhomboid Major performs Adduction (retraction) and Elevation, while Rhomboid Minor performs Medial (downward) rotation

    Correct Answer
    A. Rhomboid Major and Minor have the same actions: Adduction (retraction) of the scapula & Medial (downward) rotation
    Explanation
    The correct answer states that the Rhomboid Major and Minor have the same actions, which are Adduction (retraction) of the scapula and Medial (downward) rotation. This means that both muscles work together to pull the scapula closer to the spine (adduction) and rotate it downward towards the midline of the body (medial rotation).

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  • 25. 

    Where do Rhomboid Major and Minor insert?

    • A.

      Vertebral border of the scapula from the root of the spine to inferior angle

    • B.

      Superior angle of the scapula

    • C.

      Spine of the scapula

    • D.

      Root of the spine of the scapula

    • E.

      Rhomboid Major inserts at (A) and Rhomboid Minor inserts at (D)

    • F.

      Rhomboid Major inserts at (B) and Rhomboid Minor inserts at (C)

    Correct Answer
    E. Rhomboid Major inserts at (A) and Rhomboid Minor inserts at (D)
    Explanation
    The correct answer is that the Rhomboid Major inserts at the vertebral border of the scapula from the root of the spine to the inferior angle, while the Rhomboid Minor inserts at the root of the spine of the scapula.

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  • 26. 

    Identify the correct origin for Rhomboid Minor.

    • A.

      C7 - T1 transverse processes

    • B.

      C2-T2 spinous processes

    • C.

      C7 - T1 spinous processes

    • D.

      T2 - T7 spinous processes

    Correct Answer
    C. C7 - T1 spinous processes
    Explanation
    The correct origin for Rhomboid Minor is the C7-T1 spinous processes. The rhomboid minor is a muscle located in the upper back, and it originates from the spinous processes of the cervical vertebrae C7 and T1. These spinous processes are the bony projections that extend from the back of each vertebra. Therefore, the correct answer is C7-T1 spinous processes.

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  • 27. 

    Identify the correct origin for Rhomboid Major.

    • A.

      T2-T5 spinous processes

    • B.

      C7-T1 spinous processes

    • C.

      T1-T6 spinous processes

    Correct Answer
    A. T2-T5 spinous processes
    Explanation
    The correct origin for Rhomboid Major is the T2-T5 spinous processes. The rhomboid major muscle is located in the upper back and connects the spinous processes of the thoracic vertebrae to the medial border of the scapula. The T2-T5 spinous processes specifically refer to the vertebrae in the thoracic region between the second and fifth ribs. This muscle plays a role in retracting and stabilizing the scapula, and its origin at the T2-T5 spinous processes allows it to perform these functions effectively.

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  • 28. 

    Identify the correct origin and insertion for the Serratus Anterior.

    • A.

      O : Lateral surface of external obliques (by finger like slips)

    • B.

      O: Lateral surface of the upper 8 ribs (by finger like slips)

    • C.

      O: Lateral surface of the lower 8 ribs (by finger like slips)

    • D.

      I: Vertebral border of scapula - anterior surface

    • E.

      I: Vertebral border of scapula - posterior surface

    • F.

      I: Axillary border of scapula - anterior surface

    Correct Answer(s)
    B. O: Lateral surface of the upper 8 ribs (by finger like slips)
    D. I: Vertebral border of scapula - anterior surface
    Explanation
    The correct origin for the Serratus Anterior is the lateral surface of the upper 8 ribs (by finger like slips). The correct insertion for the muscle is the vertebral border of the scapula - anterior surface.

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  • 29. 

    Correctly identify the actions of Serratus Anterior.

    • A.

      Abduction (protraction) of the scapula

    • B.

      Lateral (upward) rotation of the scapula

    • C.

      Stabilizes scapula against chest wall

    • D.

      Depression of scapula (lower fibers)

    • E.

      Assists forced exhalation

    • F.

      Adduction (retraction) of the scapula

    • G.

      Medial (downward) rotation of the scapula

    • H.

      Elevation of the scapula (upper fibers)

    Correct Answer(s)
    A. Abduction (protraction) of the scapula
    B. Lateral (upward) rotation of the scapula
    C. Stabilizes scapula against chest wall
    D. Depression of scapula (lower fibers)
    E. Assists forced exhalation
    Explanation
    The Serratus Anterior is responsible for several actions. It helps in the abduction (protraction) of the scapula, which means it moves the scapula away from the midline of the body. It also contributes to the lateral (upward) rotation of the scapula, which involves the movement of the scapula upwards. The Serratus Anterior stabilizes the scapula against the chest wall, providing support and preventing excessive movement. The lower fibers of the muscle are involved in the depression of the scapula, which means they help lower the scapula downwards. Additionally, the Serratus Anterior assists in forced exhalation, playing a role in breathing.

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  • 30. 

    Identify the correct origin for Pectoralis Minor.

    • A.

      Medial half of clavicle

    • B.

      Anterior surface of ribs 3, 4, 5, near costal cartilages

    • C.

      Cartilages of superior 6 ribs

    • D.

      Sternum

    Correct Answer
    B. Anterior surface of ribs 3, 4, 5, near costal cartilages
    Explanation
    The correct origin for Pectoralis Minor is the anterior surface of ribs 3, 4, 5, near the costal cartilages.

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  • 31. 

    Identify the correct insertion for Pectoralis Minor.

    • A.

      Coracoid process of scapula (medial border of superior surface)

    • B.

      Inferior shaft of clavicle - middle 1/3

    • C.

      Lateral lip of the bicipital (intertubercular) groove of humerus

    • D.

      Acromion process (lateral border of inferior surface)

    Correct Answer
    A. Coracoid process of scapula (medial border of superior surface)
    Explanation
    The correct insertion for Pectoralis Minor is the coracoid process of the scapula (medial border of superior surface). This means that the muscle attaches to the inner edge of the upper surface of the coracoid process.

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  • 32. 

    Which of the following is NOT an action of the Pectoralis Minor?

    • A.

      Abduction (protraction)

    • B.

      Depression

    • C.

      Medial (downward) rotation

    • D.

      Stabilizes scapula against chest wall

    • E.

      Anterior tilt of scapula

    • F.

      Assists forced inhalation

    Correct Answer
    D. Stabilizes scapula against chest wall
    Explanation
    The Pectoralis Minor is a muscle that is located in the chest region. It is responsible for several actions, including abduction (protraction), depression, medial (downward) rotation, anterior tilt of the scapula, and assisting forced inhalation. However, stabilizing the scapula against the chest wall is not one of its actions.

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  • 33. 

    Identify the correct origin/insertion for the Subclavius.

    • A.

      O: Sternum I: Inferior shaft of the clavicle - medial 2/3

    • B.

      O: 1st rib costocartilage junction I: Inferior shaft of clavicle - middle 1/3

    • C.

      O: Body of 1st rib I: Inferior shaft of clavicle - middle 1/3

    • D.

      O: Neck of 1st rib I: Inferior shaft of clavicle - lateral 2/3

    Correct Answer
    B. O: 1st rib costocartilage junction I: Inferior shaft of clavicle - middle 1/3
    Explanation
    The correct origin/insertion for the Subclavius is the 1st rib costocartilage junction and the inferior shaft of the clavicle - middle 1/3.

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  • 34. 

    Identify the insertion for the clavicular and sternocostal heads of Pectoralis Major.

    • A.

      Clavicular - lateral lip of bicipital groove of humerus Sternocostal - medial lip of bicipital groove of humerus

    • B.

      They both insert at the medial lip of bicipital groove of humerus

    • C.

      Clavicular - greater tubercle of humerus Sternocostal - lesser tubercle of humerus

    • D.

      They both insert at the greater tubercle of humerus.

    • E.

      They both insert at the lateral lip of bicipital groove of humerus.

    • F.

      They both insert at the coracoid process of the scapula.

    Correct Answer
    E. They both insert at the lateral lip of bicipital groove of humerus.
    Explanation
    The correct answer is that both the clavicular and sternocostal heads of the Pectoralis Major insert at the lateral lip of the bicipital groove of the humerus. This means that both parts of the muscle attach to the same point on the humerus bone, specifically the outer edge of the groove where the long head of the biceps tendon runs. This insertion point allows the Pectoralis Major to contribute to movements of the shoulder joint, such as flexion, adduction, and medial rotation.

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  • 35. 

    Identify the correct origin for the clavicular head of Pectoralis Major.

    • A.

      Medial half of clavicle

    • B.

      Lateral half of clavicle

    • C.

      Middle 1/3 of clavicle

    • D.

      Medial half of clavicle - superior surface

    Correct Answer
    A. Medial half of clavicle
    Explanation
    The correct origin for the clavicular head of Pectoralis Major is the medial half of the clavicle.

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  • 36. 

    Identify the correct origin(s) of the sternocostal head of the Pectoralis Major.

    • A.

      Sternum

    • B.

      Ribs 3-5

    • C.

      Cartilages of superior 6 ribs

    • D.

      T1-T5 spinous processes

    • E.

      Thoracocolumbar aponeurosis

    • F.

      Aponeurosis of external oblique muscles

    Correct Answer(s)
    A. Sternum
    C. Cartilages of superior 6 ribs
    F. Aponeurosis of external oblique muscles
    Explanation
    The sternocostal head of the Pectoralis Major originates from the sternum, cartilages of the superior 6 ribs, and the aponeurosis of the external oblique muscles.

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  • 37. 

    Identify the action of BOTH heads of Pectoralis Major.

    • A.

      Adduction of humerus

    • B.

      Abduction of humerus

    • C.

      Horizontal Adduction

    • D.

      Medial rotation of the humerus

    • E.

      Lateral rotation of the humerus

    • F.

      Depression of clavicle

    Correct Answer(s)
    A. Adduction of humerus
    C. Horizontal Adduction
    D. Medial rotation of the humerus
    Explanation
    The Pectoralis Major is a large muscle located in the chest. It has two heads, the clavicular head and the sternal head. The clavicular head is responsible for the horizontal adduction of the humerus, which means bringing the arm towards the midline of the body. The sternal head is responsible for the adduction of the humerus, which means moving the arm towards the body's midline. Additionally, both heads contribute to the medial rotation of the humerus, which is the inward rotation of the arm. Therefore, the correct answer is Adduction of humerus, Horizontal Adduction, and Medial rotation of the humerus.

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  • 38. 

    The clavicular head of Pectoralis Major has the additional specific action of humeral flexion.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The clavicular head of the Pectoralis Major muscle is responsible for humeral flexion, which means it helps to bring the arm towards the body by bending the elbow joint. This specific action is in addition to the overall function of the Pectoralis Major muscle, which is to adduct and medially rotate the arm at the shoulder joint. Therefore, the statement that the clavicular head of Pectoralis Major has the additional specific action of humeral flexion is true.

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  • 39. 

    The sternocostal head of Pectoralis Major has the additional specific actions of humeral extension and assistance in anterior tilt of scapula.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The sternocostal head of the Pectoralis Major muscle is responsible for additional actions such as humeral extension and assisting in the anterior tilt of the scapula. This means that when the muscle contracts, it helps to extend the arm backward at the shoulder joint and also assists in tilting the shoulder blade forward. Therefore, the statement is true.

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  • 40. 

    Identify which of the following is NOT an origin for Latissimus Dorsi.

    • A.

      Thoracolumbar aponeurosis

    • B.

      Lower 6 thoracic spinous processes

    • C.

      Sacrum

    • D.

      Spine of the scapula

    • E.

      Iliac crest of ilium

    • F.

      Lower 3 to 4 ribs

    • G.

      Inferior angle of scapula

    Correct Answer
    D. Spine of the scapula
    Explanation
    The Latissimus Dorsi muscle originates from the thoracolumbar aponeurosis, lower 6 thoracic spinous processes, sacrum, iliac crest of ilium, lower 3 to 4 ribs, and the inferior angle of the scapula. However, it does not originate from the spine of the scapula.

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  • 41. 

    Identify the correct insertion of Latissiums Dorsi.

    • A.

      Bicipital (intertubercular) groove of humerus

    • B.

      Greater tubercle of humerus

    • C.

      Lesser tubercle of humerus

    • D.

      Sprial groove of humerus

    Correct Answer
    A. Bicipital (intertubercular) groove of humerus
    Explanation
    The correct insertion of the Latissimus Dorsi muscle is the Bicipital (intertubercular) groove of the humerus. This muscle originates from the lower spine and iliac crest and inserts into the front of the upper arm bone. It is responsible for various movements of the shoulder joint, such as extension, adduction, and medial rotation. The Bicipital groove is a depression on the front of the humerus where the tendon of the muscle passes through and attaches.

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  • 42. 

    The Latissimus Dorsi performs extension of the humerus, medial rotation, assists in depression of the scapula and ______________.

    • A.

      Adduction of humerus

    • B.

      Abduction of humerus

    • C.

      Medial (downward) rotation of scapula

    • D.

      Lateral (upward) rotation of scapula

    • E.

      Adduction of scapula

    Correct Answer(s)
    A. Adduction of humerus
    C. Medial (downward) rotation of scapula
    Explanation
    The Latissimus Dorsi muscle performs multiple actions, including extension of the humerus and medial rotation. In addition to these movements, it also assists in depression of the scapula. Therefore, the correct answer is adduction of the humerus and medial (downward) rotation of the scapula.

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  • 43. 

    Identify the correct origin/insertion for Supraspinatus.

    • A.

      O: Supraspinous fossa of scapula I: Lesser tubercle of humerus

    • B.

      O: Supraspinous process of scapula I: Anatomical neck of the humerus

    • C.

      O: Spine of the scapula I: Greater tubercle of humerus (inferior facet)

    • D.

      O: Supraspinous fossa of scapula I: Greater tubercle of humerus (superior facet)

    Correct Answer
    D. O: Supraspinous fossa of scapula I: Greater tubercle of humerus (superior facet)
    Explanation
    The correct origin/insertion for the Supraspinatus muscle is the Supraspinous fossa of the scapula and the Greater tubercle of the humerus (superior facet). This means that the muscle originates from the Supraspinous fossa of the scapula and inserts onto the Greater tubercle of the humerus at its superior facet.

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  • 44. 

    Identify the correct actions of the Supraspinatus.

    • A.

      Adduction

    • B.

      Abduction

    • C.

      Scaption of humerus

    • D.

      Elevation of humerus

    • E.

      Medial (downward) rotation of humerus

    • F.

      Stabilization of head of humerus

    Correct Answer(s)
    B. Abduction
    C. Scaption of humerus
    F. Stabilization of head of humerus
    Explanation
    The supraspinatus is a muscle located in the shoulder joint. Its main actions include abduction, scaption of the humerus, and stabilization of the head of the humerus. Abduction refers to moving the arm away from the body, scaption of the humerus refers to raising the arm at a 30-degree angle from the body, and stabilization of the head of the humerus helps to keep the shoulder joint stable during movement. Therefore, the correct actions of the supraspinatus are abduction, scaption of the humerus, and stabilization of the head of the humerus.

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  • 45. 

    Identify the muscle responsible for the first 15 degress of humeral abduction.

    • A.

      Supraspinatus

    • B.

      Subscapularis

    • C.

      Infraspinatus

    • D.

      Teres Minor

    Correct Answer
    A. Supraspinatus
    Explanation
    The supraspinatus muscle is responsible for the first 15 degrees of humeral abduction. This muscle is located in the upper part of the shoulder and plays a key role in initiating the movement of raising the arm away from the body. It is one of the four muscles that make up the rotator cuff and is specifically responsible for the initial phase of abduction before other muscles, such as the deltoid, take over.

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  • 46. 

    The Infraspinatus muscle has its origin at the  _____________ fossa of scapula and its insertion at the ____________ tubercle of the humerus (__________ facet).

    • A.

      Infraspinous/Lesser/Middle

    • B.

      Infraspinous/Greater/Middle

    • C.

      Infraspinous/Lesser/Inferior

    • D.

      Infraspinous/Greater/Lateral

    Correct Answer
    B. Infraspinous/Greater/Middle
    Explanation
    The Infraspinatus muscle originates from the infraspinous fossa of the scapula and inserts at the greater tubercle of the humerus on the middle facet.

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  • 47. 

    Correctly identify the action(s) of the Infraspinatus muscle.

    • A.

      Lateral rotation

    • B.

      Extension of humerus

    • C.

      Elevation of scapula

    • D.

      Lateral (upward) rotation of scapula

    Correct Answer(s)
    A. Lateral rotation
    B. Extension of humerus
    Explanation
    The Infraspinatus muscle is responsible for two actions: lateral rotation and extension of the humerus. Lateral rotation refers to the movement of rotating the arm away from the midline of the body, while extension of the humerus involves straightening or extending the upper arm. Therefore, the correct answer is lateral rotation and extension of humerus.

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  • 48. 

    Identify the action(s) of Teres Minor.

    • A.

      Medial (downward) rotation of scapula

    • B.

      Depression of scapula

    • C.

      Lateral rotation

    • D.

      Adduction (retraction) of scapula

    • E.

      Extension of humerus

    Correct Answer(s)
    C. Lateral rotation
    E. Extension of humerus
    Explanation
    The Teres Minor is responsible for two actions: lateral rotation and extension of the humerus. Lateral rotation refers to the movement of the arm away from the midline of the body, while extension of the humerus refers to the movement of the arm straightening or moving backward. Therefore, the Teres Minor helps in rotating the arm outward and extending it backward.

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  • 49. 

    Identify the correct origin and insertion for Teres Minor.

    • A.

      O: Upper 2/3 axillary border of scapula

    • B.

      O: Lower 2/3 of axillary border of scapula

    • C.

      O: Axillary border of scapula from spine to inferior angle

    • D.

      I: Greater tubercle of humerus (superior facet)

    • E.

      I: Lesser tubercle of humerus

    • F.

      I: Greater tubercle of humerus (inferior facet)

    Correct Answer(s)
    A. O: Upper 2/3 axillary border of scapula
    F. I: Greater tubercle of humerus (inferior facet)
    Explanation
    The correct origin for Teres Minor is the upper 2/3 of the axillary border of the scapula. The correct insertion for Teres Minor is the greater tubercle of the humerus, specifically the inferior facet.

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  • 50. 

    Identify the correct action(s) for the Subscapularis.

    • A.

      Medial rotation and adduction of humerus

    • B.

      Medial rotation and abduction of humerus

    • C.

      Lateral rotation and adduction of humerus

    • D.

      Abduction of humerus

    • E.

      Medial rotation and adduction of humerus + lateral (upward) rotation of scapula

    Correct Answer
    A. Medial rotation and adduction of humerus
    Explanation
    The Subscapularis muscle is responsible for the medial rotation and adduction of the humerus. This means that it helps to rotate the arm inward towards the midline of the body and bring the arm closer to the body. It does not contribute to lateral rotation or abduction of the humerus. Additionally, the answer also mentions the lateral (upward) rotation of the scapula, which is not a specific action of the Subscapularis muscle.

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Quiz Review Timeline +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 25, 2011
    Quiz Created by
    Contactlindz
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