Muscles And Brachial Plexus - Lab Exam 1

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  • 1/71 Questions

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

    • Trunks, Divisions, Roots, Cords, Terminal Branches
    • Roots, Trunks, Divisions, Cords, Terminal Branches
    • Cords, Roots, Divisions, Trunks, Terminal Branches
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Brachial Plexus Quizzes & Trivia
About This Quiz

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.

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  • 2. 

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

    • Teres Major and Minor

    • Rhomboid Major and Minor

    • Supraspinatus and Infraspinatus

    • Levator Scapulae and Subscapularis

    Correct Answer
    A. 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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  • 3. 

    The Upper Subscapular nerve innervates which of the following muscles?

    • Subclavius

    • Subscapularis

    • Supraspinatus

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

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  • 4. 

    Identify the correct origin/insertion for the Subscapularis.

    • O: Subscapular process of scapula I: Greater tubercle of humerus (superior facet)

    • O: Subscapular fossa of scapula I: Lesser tubercle of humerus

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

    • O: Infraspinous fossa of scapula I: Greater tubercle of humerus (middle facet)

    Correct Answer
    A. O: Subscapular fossa of scapula I: Lesser tubercle of humerus
    Explanation
    The correct origin/insertion for the Subscapularis is the Subscapular fossa of scapula and the Lesser tubercle of humerus.

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  • 5. 

    All 3 heads of Triceps Brachii insert at the olecranon process of the ulna.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because all three heads of the Triceps Brachii muscle, namely the long head, lateral head, and medial head, insert at the olecranon process of the ulna. The Triceps Brachii muscle is responsible for extending the forearm at the elbow joint, and its insertion at the olecranon process allows it to exert force and generate movement in this joint.

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  • 6. 

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

    • Radial

    • Medial

    • Ulnar

    • 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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  • 7. 

    Which of the following is true regarding the insertion of the Deltoid muscle?

    • All three parts insert at the deltoid tuberosity of humerus.

    • The Anterior and Middle parts insert at the deltoid tuberosity of the humerus, but the Posterior part inserts on the spiral groove of the humerus.

    • The Anterior and Posterior parts insert at the lesser tubercle, while the Middle part inserts at the deltoid tuberosity.

    • Only the Anterior part inserts at the deltoid tuberosity. The Middle and Poster parts insert at the greater tubercle and lesser tubercle, respectively.

    Correct Answer
    A. All three parts insert at the deltoid tuberosity of humerus.
    Explanation
    The deltoid muscle is a large, triangular muscle located on the shoulder. It has three parts: anterior, middle, and posterior. The deltoid tuberosity is a bony prominence on the humerus where the muscle inserts. The correct answer states that all three parts of the deltoid muscle insert at the deltoid tuberosity of the humerus. This means that the muscle fibers from all three parts converge and attach to this specific point on the humerus bone.

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  • 8. 

    Identify the correct origin for Pectoralis Minor.

    • Medial half of clavicle

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

    • Cartilages of superior 6 ribs

    • Sternum

    Correct Answer
    A. 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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  • 9. 

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

    • Supraspinatus

    • Subscapularis

    • Infraspinatus

    • 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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  • 10. 

    The Subscapularis muscle is found on the posterior surface of the scapula.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    It is found on the ANTERIOR surface.

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  • 11. 

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

    • Levator scapulae

    • Rhomboid Major and Minor

    • Subscapularis

    Correct Answer
    A. 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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  • 12. 

    Identify the correct origin/insertion for Supraspinatus.

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

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

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

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

    Correct Answer
    A. 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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  • 13. 

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

    • Musculocutaneous Nerve

    • Median Nerve

    • Ulnar Nerve

    • Axillary Nerve

    • Pectoral Nerve

    • Radial Nerve

    Correct Answer(s)
    A. Musculocutaneous Nerve
    A. Median Nerve
    A. Ulnar Nerve
    A. Axillary Nerve
    A. 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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  • 14. 

    Identify the correct insertion of Latissiums Dorsi.

    • Bicipital (intertubercular) groove of humerus

    • Greater tubercle of humerus

    • Lesser tubercle of humerus

    • 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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  • 15. 

    Abduction of the humerus to 90 degress is performed by which of the following muslces?

    • Deltoid - Anterior

    • Deltoid - Middle

    • Deltoid - Posterior

    • Pectoralis Minor

    • Teres Major

    Correct Answer
    A. Deltoid - Middle
    Explanation
    The abduction of the humerus to 90 degrees is performed by the Deltoid - Middle muscle. The deltoid muscle is responsible for the movement of the arm away from the body, known as abduction. The deltoid has three parts: anterior, middle, and posterior. In this case, the middle portion of the deltoid muscle is specifically involved in the abduction of the humerus to 90 degrees.

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  • 16. 

    Identify the origin for the Levator Scapula.

    • C1-4 transverse processes

    • C1 - 7 transverse processes & Ligamentum nuchae

    • C1 - 7 transverse processes

    • 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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  • 17. 

    The Anterior Deltoid originates at the _________  third of the clavicle. The Middle Deltoid originates on the lateral surface of the ________________. The Posterior Deltoid originates on the _________________.

    • Lateral/Spine of the Scapula/Acromion

    • Medial/Coracoid Process/Inferior Angle of Scapula

    • Lateral/Acromion/Spine of the Scapula

    • Medial/Root of the Spine/Coracoid Process

    Correct Answer
    A. Lateral/Acromion/Spine of the Scapula
    Explanation
    The correct answer is "Lateral/Acromion/Spine of the Scapula." The anterior deltoid originates at the lateral third of the clavicle, the middle deltoid originates on the lateral surface of the acromion, and the posterior deltoid originates on the spine of the scapula.

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  • 18. 

    The long head of Tricpes Brachii is located medially and originates at the ______________.

    • Infraglenoid tubercle of scapula

    • Posterior humerus above spiral groove

    • Posterior humerus below spiral groove

    • Coracoid process

    Correct Answer
    A. Infraglenoid tubercle of scapula
    Explanation
    The long head of the Triceps Brachii muscle is located medially and originates at the Infraglenoid tubercle of the scapula.

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  • 19. 

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

    • True

    • False

    Correct Answer
    A. 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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  • 20. 

    Identify the correct insertion for Pectoralis Minor.

    • Coracoid process of scapula (medial border of superior surface)

    • Inferior shaft of clavicle - middle 1/3

    • Lateral lip of the bicipital (intertubercular) groove of humerus

    • 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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  • 21. 

    Identify the correct origin for the middle trapezius.

    • Ligamentum nuchae

    • C7-T3 spinous processes

    • Spine of the scapula

    • C1-4 transverse processes

    Correct Answer
    A. 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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  • 22. 

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

    • True

    • 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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  • 23. 

    Identify the correct origin and insertion for the Coracobrachialis.

    • O: Acromion process of scapula

    • O: Coracoid process of scapula

    • O: Lateral 1/3 of clavicle

    • I: Middle 1/3 of medial surface of humeral shaft

    • I: Distal 2/3 of lateral surface of humeral shaft

    • I: Below the spiral groove of the humerus

    Correct Answer(s)
    A. O: Coracoid process of scapula
    A. I: Middle 1/3 of medial surface of humeral shaft
    Explanation
    The correct origin for the Coracobrachialis is the coracoid process of the scapula, and the correct insertion is the middle 1/3 of the medial surface of the humeral shaft.

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  • 24. 

    The Brachialis muscle originates at the lower half of the anterior shaft of the humerus. It terminates at the ____________ and ___________ of the ______________. It performs flexion of the elbow.

    • Tuberosity/Coronoid process/Ulna

    • Tuberosity/Coracoid process/Radius

    • Tuberosity/Trochlear notch/Ulna

    • Tuberosity/Anterior Oblique Line/Radius

    Correct Answer
    A. Tuberosity/Coronoid process/Ulna
    Explanation
    The Brachialis muscle originates at the lower half of the anterior shaft of the humerus. It terminates at the tuberosity and coronoid process of the ulna. It performs flexion of the elbow.

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  • 25. 

    Identify the correct origin for Rhomboid Major.

    • T2-T5 spinous processes

    • C7-T1 spinous processes

    • 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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  • 26. 

    Identify the correct actions of Teres Major.

    • Extension, Medial rotation, Adduction of humerus

    • Extension, Lateral rotation, Adduction of humerus

    • Extension, Medial rotation, Abduction of humerus

    • Extension, Retraction of Scapula, Medial rotation, Adduction of humerus

    Correct Answer
    A. Extension, Medial rotation, Adduction of humerus
    Explanation
    The correct actions of Teres Major are extension, medial rotation, and adduction of the humerus. Teres Major helps to extend the arm backward, rotate it inward towards the midline of the body, and bring it closer to the body's centerline. These actions are important for various movements such as pulling, throwing, and reaching across the body.

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  • 27. 

    The medial head of the Triceps Brachii originates at the ______________.

    • Infraglenoid tubercle of scapula

    • Posterior humerus above spiral groove

    • Posterior humerus below spiral groove

    Correct Answer
    A. Posterior humerus below spiral groove
    Explanation
    The medial head of the Triceps Brachii muscle originates below the spiral groove of the posterior humerus. This means that it originates on the posterior side of the humerus bone, specifically below the area where the spiral groove is located.

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  • 28. 

    Identify the correct action(s) for the Subscapularis.

    • Medial rotation and adduction of humerus

    • Medial rotation and abduction of humerus

    • Lateral rotation and adduction of humerus

    • Abduction of humerus

    • 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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  • 29. 

    The Biceps Brachii has two heads, the long and short. The long head is located _______ and the short head is located _________. The long head originates at the _____________, while the short head originates at the _____________. Both heads insert at the Tuberosity of the Radius and the _______________.

    • Laterally/Medially/Coracoid process of scapula/Supraglenoid tubercle of scapula/Olecranon process

    • Medially/Laterally/Supraglenoid tubercle of scapula/Acromion process of scapula/Bicipital Aponeurosis

    • Medially/Laterally/Supraglenoid tubercle of scapula/Coracoid process of scapula/ Interosseus border of the ulna

    • Laterally/Medially/Supraglenoid tubercle of scapula/Coracoid process of scapula/Bicipital Aponeurosis

    Correct Answer
    A. Laterally/Medially/Supraglenoid tubercle of scapula/Coracoid process of scapula/Bicipital Aponeurosis
    Explanation
    The Biceps Brachii has two heads, the long and short. The long head is located medially and the short head is located laterally. The long head originates at the supraglenoid tubercle of the scapula, while the short head originates at the coracoid process of the scapula. Both heads insert at the Tuberosity of the Radius and the Bicipital Aponeurosis.

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  • 30. 

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

    • Teres Major

    • Teres Minor

    • Rhomboid Major and Minor

    • Pectoral Major - Clavicular Head

    • Deltoids

    Correct Answer(s)
    A. Teres Minor
    A. 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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  • 31. 

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

    • Pectoralis Major - Clavicular Head

    • Pectoralis Major - Sternal Head

    • 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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  • 32. 

    Which of the following branches off of the lateral cord?

    • Suprascapular Nerve

    • Lateral Pectoral Nerve

    • Musculocutaneous Nerve

    • Long Thoracic Nerve

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

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  • 33. 

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

    • Suprascapular Nerve

    • Dorsal Scapular Nerve

    • Nerve to the Subclavius

    Correct Answer
    A. 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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  • 34. 

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

    • Teres Major

    • Teres Minor

    • Subscapularis

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

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  • 35. 

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

    • Coracobrachialis

    • Biceps Brachii

    • Triceps Brachii

    • Skin of the Forearm

    • Brachialis

    • Brachioradialis

    Correct Answer(s)
    A. Coracobrachialis
    A. Biceps Brachii
    A. 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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  • 36. 

    The Lateral Pectoral nerve innervates which of the following?

    • Pectoralis Major - Sternal Head

    • Pectoralis Minor

    • Pectoralis Major - Clavicular Head

    Correct Answer
    A. 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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  • 37. 

    The lateral head of the Triceps Brachii originates at the _________________.

    • Infraglenoid tubercle of scapula

    • Posterior humerus above sprial groove

    • Posterior humerus below spiral groove

    Correct Answer
    A. Posterior humerus above sprial groove
    Explanation
    The correct answer is "Posterior humerus above spiral groove." The lateral head of the Triceps Brachii muscle originates from the posterior aspect of the humerus bone, specifically above the spiral groove. This is an important attachment point for the muscle and helps in its function of extending the elbow joint.

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  • 38. 

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

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

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

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

    • 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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  • 39. 

    Identify the correct origin and insertion for the Brachioradialis.

    • O: Lateral supracondylar ridge of humerus

    • O: Medial supracondylar ridge of humerus

    • O: Lateral epicondylar ridge of humerus

    • I: Styloid process of ulna

    • I: Styloid process of radius

    • I: Dorsal tubercle

    Correct Answer(s)
    A. O: Lateral supracondylar ridge of humerus
    A. I: Styloid process of radius
    Explanation
    The correct origin for the Brachioradialis is the lateral supracondylar ridge of the humerus, while the correct insertion is the styloid process of the radius.

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  • 40. 

    Identify the correct insertion for the Levator Scapula.

    • Vertebral border of scapula and spine of scapula

    • Vertebral border of scapula from superior angle to root of spine

    • Vertebral border of scapula from superior angle to inferior angle

    • Axillary border and acromion process

    Correct Answer
    A. 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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  • 41. 

    Identify the correct origin for Rhomboid Minor.

    • C7 - T1 transverse processes

    • C2-T2 spinous processes

    • C7 - T1 spinous processes

    • T2 - T7 spinous processes

    Correct Answer
    A. 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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  • 42. 

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

    • Infraspinous/Lesser/Middle

    • Infraspinous/Greater/Middle

    • Infraspinous/Lesser/Inferior

    • Infraspinous/Greater/Lateral

    Correct Answer
    A. 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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  • 43. 

    Extension, Horizontal Abduction, Lateral Rotation and Scaption of the humerus are actions of which of the following muscles?

    • Deltoid - Anterior

    • Deltoid - Middle

    • Deltoid - Posterior

    • Coracobrachialis

    • Pectoralis Major - Clavicular Head

    Correct Answer
    A. Deltoid - Posterior
    Explanation
    Extension, horizontal abduction, lateral rotation, and scaption of the humerus are actions of the Deltoid - Posterior muscle. This muscle is located at the back of the shoulder and is responsible for these movements. It helps in extending the arm backward, moving the arm away from the body in a horizontal motion, rotating the arm outward, and raising the arm in a diagonal plane.

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  • 44. 

    Identify the correct origin/insertion for the Subclavius.

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

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

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

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

    Correct Answer
    A. 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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  • 45. 

    The Coracobrachialis performs flexion of the humerus and _________?

    • Flexion of the elbow

    • Adduction of the humerus

    • Abduction of the humerus

    • Medial rotation of the humerus

    Correct Answer
    A. Adduction of the humerus
    Explanation
    The coracobrachialis muscle is responsible for flexion of the humerus, which is the movement of bringing the upper arm closer to the body. In addition to that, it also performs adduction of the humerus, which is the movement of bringing the upper arm towards the midline of the body. This muscle helps in stabilizing the shoulder joint and assisting in various arm movements.

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  • 46. 

    Identify the correct origin and insertion for the Serratus Anterior.

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

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

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

    • I: Vertebral border of scapula - anterior surface

    • I: Vertebral border of scapula - posterior surface

    • I: Axillary border of scapula - anterior surface

    Correct Answer(s)
    A. O: Lateral surface of the upper 8 ribs (by finger like slips)
    A. 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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  • 47. 

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

    • True

    • 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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  • 48. 

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

    • Thoracolumbar aponeurosis

    • Lower 6 thoracic spinous processes

    • Sacrum

    • Spine of the scapula

    • Iliac crest of ilium

    • Lower 3 to 4 ribs

    • Inferior angle of scapula

    Correct Answer
    A. 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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  • 49. 

    Where do Rhomboid Major and Minor insert?

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

    • Superior angle of the scapula

    • Spine of the scapula

    • Root of the spine of the scapula

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

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

    Correct Answer
    A. 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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Quiz Review Timeline (Updated): Mar 22, 2023 +

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

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