Question

In terms of adduction and abduction of the arm, which muscle opposes the pectoralis major and latissimus dorsi?

A) teres major
B) infraspinatus
C) coracobrachialis
D) deltoid

Answer 1

The deltoid muscle is the one that opposes the pectoralis major and latissimus dorsi in terms of arm adduction and abduction, as it is responsible for abducting the arm.

Step-by-step explanation:

In terms of adduction and abduction of the arm, the muscle that opposes the pectoralis major and latissimus dorsi is the deltoid. The pectoralis major and latissimus dorsi are muscles that facilitate the adduction movement of the arm, bringing it closer to the body. On the other hand, the deltoid muscle is the major abductor of the arm, working to move it away from the body's midline. The deltoid also assists in flexion and medial rotation as well as extension and lateral rotation of the arm.