Question

Label the three visible muscles of the rotator cuff in the following posterior view of the deep muscles that move the arm.a. ___b. ___c. ___

Accepted Answer

Step 1: Understand the anatomy of the rotator cuff muscles. The rotator cuff is composed of four muscles that stabilize the shoulder joint: supraspinatus, infraspinatus, teres minor, and subscapularis. In a posterior view, the visible muscles are typically supraspinatus, infraspinatus, and teres minor. Step 2: Identify the location of each muscle in the posterior view. The supraspinatus is located at the top of the scapula, above the spine of the scapula. The infraspinatus is found below the spine of the scapula, covering most of the posterior surface. The teres minor is located just below the infraspinatus, near the lateral border of the scapula. Step 3: Match each label (a, b, c) to the corresponding muscle based on their anatomical position. For example, the topmost label likely corresponds to supraspinatus, the middle label to infraspinatus, and the lowest label to teres minor. Step 4: Confirm your identification by recalling the function and attachment points of each muscle. Supraspinatus abducts the arm, infraspinatus and teres minor laterally rotate the arm, and all attach to the greater tubercle of the humerus. Step 5: Write down the names of the muscles next to each label accordingly: a. Supraspinatus, b. Infraspinatus, c. Teres minor.

Label the three visible muscles of the rotator cuff in the following posterior view of the deep muscles that move the arm.
a. _
b. _
c. ___

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Key Concepts

Rotator Cuff Muscles

Posterior View Anatomy of the Shoulder

Muscle Identification Techniques