Muscles of the Shoulder

Question 1

Depending on the active region this muscle may elevate, adduct, depress, or rotate the scapula and/or elevate the clavicle…it can also extend or hyperextend the neck! It originates at the occipital bone and spinous processes of the thoracic vertebrae and inserts at the clavicle and scapula.

Answer 1

Trapezius

Question 2

This muscle originates at the transverse processes of the first four vertebrae, inserts at the vertebral border of the scapula, and its action id to elevate the scapula.

Answer 2

Levator scapulae

Question 3

This muscle inserts at the clavicle, originates at the first rib, and its action is to depress and protract the shoulder.

Answer 3

Subclavius

Question 4

This muscle originates at the anterior surfaces of ribs 3-5, inserts at the coracoid process of the scapula, and its action is to depress and protract the shoulder, rotate the scapula laterally (downward), and elevate the ribs if the scapula is stationary.

Answer 4

Pectoralis minor

Question 5

This muscle’s action is to protract the shoulder, abduct and medially rotate the scapula (upward)…it inserts in the anterior surface of the vertebral border of the scapula, and originates at the anterior and superior margins of ribs 1-9.

Answer 5

Serratus anterior

Question 6

This muscle inserts at the vertebral border of the scapula, its action is to adduct and rotate the scapula laterally (downward), and its origin is the spinous processes of lower cervical and upper thoracic vertebrae.

Answer 6

Rhomboid muscles