MCQ – 96070

Which of the following muscles is not included in the rotator cuff?

Correct Answer � C Explanation

The rotator cuff is a group of four muscles that stabilize the shoulder joint and provide dynamic movement. These muscles are:

1. Supraspinatus: Initiates arm abduction.
2. Infraspinatus: Performs external rotation of the arm.
3. Teres minor: Assists with external rotation.
4. Subscapularis: Performs internal rotation.

Why Teres Major is Not Included:

• Teres major is not part of the rotator cuff because its function differs. It primarily adducts and medially rotates the arm.
• The teres major inserts on the medial lip of the bicipital groove of the humerus, while the rotator cuff muscles attach to the humeral head to stabilize the glenohumeral joint.
• Instead of stabilizing the shoulder, the teres major works synergistically with the latissimus dorsi to control shoulder movements.

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Reason to Rule Out Incorrect Options:

1. Supraspinatus (Option A): This is part of the rotator cuff, initiating arm abduction.
2. Infraspinatus (Option B): Part of the rotator cuff, responsible for external rotation of the arm.
3. Teres minor (Option D): Also part of the rotator cuff, assisting with external rotation and stabilizing the humeral head.