Unit 1 Anatomy: Muscles Of The Back

Explanation
The muscle that matches the given description is the serratus posterior inferior. It originates from the spinous processes of T11-L2 and inserts into the last four ribs. It is innervated by the ventral primary rami of T9-T12 spinal nerves. The action of the serratus posterior inferior is to pull the ribs down and out during inspiration.

Explanation
The muscles that match the given description are the erector spinae, longissimus, iliocostalis, and spinalis. These muscles originate from the posterior iliac crest, sacrum, sacral and inferior lumbar spinous processes, and supraspinous ligament. They insert between the superior and inferior nuchal lines. They are innervated by the dorsal rami of cervical spinal nerves. When acting together, these muscles extend the vertebral column, and when acting alone, they perform lateral flexion to the same side.

Explanation
The muscle that matches the given description is the splenius capitis. It originates from the spinal processes of C7-T4 and inserts into the mastoid process and superior nuchal line of the occipital bone. It is innervated by the dorsal rami of the spinal nerves. When acting alone, it laterally bends and rotates the neck to the side of the active muscle. When acting together, it extends the head and neck.

Explanation
The muscle that matches the given description is the semispinalis capitis. It originates from the spinous processes of C7-T4 and inserts into the transverse processes of C1-C4. It is innervated by the dorsal rami of cervical spinal nerves. The action of the semispinalis capitis is to extend the neck and rotate the head to the opposite side.

Explanation
The muscle that matches the given description is the serratus posterior superior. It originates from the spinous processes of the seventh cervical vertebra to the third thoracic vertebra and inserts into the second to fifth ribs. It is innervated by the second to fifth intercostal nerves. The main action of the serratus posterior superior is to elevate the ribs during inspiration.

Explanation
attached to C1-C4

Explanation
attached to mastoid process and superior nuchal line of occipital bone

Explanation
The muscle shown in the question is the semispinalis capitis. This muscle is located in the back of the neck and upper back region. It is part of the erector spinae muscle group and plays a role in extending and rotating the head and neck. The name "semispinalis capitis" refers to its location and function, as it is a long muscle that spans half of the length of the spine and attaches to the head.

Explanation
The semispinalis capitis muscle is involved in rotating the head to the opposite side of the active muscle. This muscle is located in the back of the head and neck and is responsible for extending and rotating the head. When one side of the semispinalis capitis muscle contracts, it causes the head to rotate towards the opposite side. Therefore, the semispinalis capitis muscle is the correct answer for this question.

Explanation
The given correct answer is deltoid. The deltoid muscle is a large, triangular muscle located on the shoulder. It is responsible for the abduction, flexion, and extension of the arm at the shoulder joint. The deltoid muscle gives the shoulder its rounded appearance and is commonly targeted in exercises such as lateral raises and shoulder presses.

Explanation
The given answer, "latissimus dorsi," is the correct answer for the question. The question is asking for the name of a muscle, specifically the one referred to as "Lower forcepts." The latissimus dorsi is a large muscle located in the back that extends from the lower spine to the upper arm. It is responsible for several movements, including pulling the arms downward and backward. Therefore, the latissimus dorsi is the muscle being referred to in the question.

Explanation
The muscle shown in the upper back is the levator scapulae. This muscle is responsible for elevating and retracting the scapula, or shoulder blade. It originates from the upper cervical vertebrae and attaches to the medial border of the scapula. When the levator scapulae contracts, it helps to lift the shoulder and rotate the scapula, allowing for movements such as shrugging or tilting the head to the side.

Explanation
The structure being referred to in this question is the rhomboid major. The rhomboid major is a muscle located in the upper back region, specifically in the medial (middle) portion. It is responsible for retracting and stabilizing the scapula (shoulder blade) towards the spine.

Explanation
The structure being referred to in this question is the rhomboid minor. The rhomboid minor is a muscle located in the upper back region. It is a small, triangular muscle that connects the scapula (shoulder blade) to the vertebrae in the spine. Its main function is to retract and stabilize the scapula, helping to maintain proper posture and shoulder movement.

Explanation
The muscle shown in the question is the supraspinatus muscle. The supraspinatus is one of the four muscles that make up the rotator cuff in the shoulder. It is located on the upper part of the scapula and helps to initiate and assist with shoulder abduction.

Explanation
The muscle shown in the picture is the teres major. It is a large muscle located in the posterior axillary region. It originates from the inferior angle of the scapula and inserts into the medial lip of the intertubercular sulcus of the humerus. The teres major works together with other muscles to perform movements of the shoulder joint, such as extension, adduction, and medial rotation.

Explanation
The muscle shown in the picture is the teres minor. It is located in the posterior axillary region. The teres minor is a small muscle that lies deep to the infraspinatus muscle. It is one of the four muscles that make up the rotator cuff in the shoulder. Its main function is to assist in the rotation of the arm and stabilization of the shoulder joint.

Explanation
The muscle depicted in the question is the trapezius muscle. The trapezius is a large, triangular muscle that extends from the base of the skull down to the middle of the back and across the shoulder blades. It is responsible for various movements of the shoulder and neck, such as shrugging the shoulders, rotating the scapula, and tilting the head.

Explanation
The correct answer is the long head of the triceps brachii. This muscle is located in the posterior axillary region and is one of the three heads of the triceps brachii muscle. It originates from the scapula and inserts into the ulna. It is responsible for extending the forearm at the elbow joint.

Explanation
The muscle shown in the question is the infraspinatus. The infraspinatus is one of the four muscles that make up the rotator cuff in the shoulder. It is located on the posterior side of the scapula and plays a key role in the external rotation and stabilization of the shoulder joint. It helps to rotate the arm outwards and is important for various movements involving the shoulder, such as throwing, lifting, and reaching.