Question

Which statement best describes the subscapularis muscle? a. it is the largest muscle that moves the arm. b. it rotates the arm medially at the shoulder joint. c. it elevates the shoulder. d. it is an axial muscle because it does not originate on the scapula.

Answer 1

in contrast, option a is incorrect because the largest muscle that moves the arm is the deltoid muscle. Option c is incorrect because the subscapularis muscle does not elevate the shoulder. And option d is incorrect because the subscapularis muscle actually originates on the scapula.

Therefore, the best statement is that the subscapularis muscle rotates the arm medially at the shoulder joint.

Step-by-step explanation:

The subscapularis muscle is one of the four muscles that make up the rotator cuff in the shoulder. Its main function is to rotate the arm medially, which means it moves the arm inward towards the body. This movement is important for activities such as throwing a ball or reaching across the body.

To understand how the subscapularis muscle works, imagine holding your arm out to the side with your palm facing down. When the subscapularis muscle contracts, it pulls the arm inward, rotating it towards the center of your body. This rotation allows you to perform tasks that require internal rotation of the shoulder joint.