Question

The ____________ assists the subscapularis in medial rotation of the arm.

A) teres minor
B) teres major
C) triceps brachii (long head)
D) deltoid (posterior fibers)

Answer 1

The teres major muscle assists the subscapularis in medial rotation of the arm, making it the correct answer to the question.

Step-by-step explanation:

The muscle that assists the subscapularis in medial rotation of the arm is the teres major. This information can be found by examining the various shoulder muscles and their functions. Specifically, the teres major muscle is a thick and flat muscle located inferior to the teres minor, and it is known for its role in extending the arm and assisting in both adduction and medial rotation of the arm. In contrast, the teres minor muscle is responsible for lateral rotation and extension of the arm, and would not assist in medial rotation. Therefore, the correct answer to the question 'The ____________ assists the subscapularis in medial rotation of the arm.' is B) teres major.