Rotator cuff is formed by all, EXCEPT?
**Core Concept**
The rotator cuff is a group of four muscles and their associated tendons that surround the shoulder joint, providing stability and enabling a wide range of motion. This complex structure is crucial for shoulder function and is frequently compromised in various pathologies.
**Why the Correct Answer is Right**
The rotator cuff consists of the subscapularis, supraspinatus, infraspinatus, and teres minor muscles. Each muscle plays a distinct role in shoulder movement and stability. The subscapularis muscle is responsible for internal rotation, while the supraspinatus stabilizes the shoulder joint and assists in abduction. The infraspinatus and teres minor muscles facilitate external rotation and adduction, respectively.
**Why Each Wrong Option is Incorrect**
**Option A:** The deltoid muscle is not considered part of the rotator cuff, although it does contribute to shoulder movement and abduction. It is a separate entity with a distinct origin and insertion.
**Option B:** The long head of the biceps tendon is associated with the shoulder joint but is not technically part of the rotator cuff. It is often involved in rotator cuff pathologies, however.
**Option C:** The coracohumeral ligament is a stabilizing structure within the shoulder joint but is not a muscle or tendon forming part of the rotator cuff.
**Option D:** This option is missing; please provide the correct options for a complete explanation.
**Clinical Pearl / High-Yield Fact**
In shoulder surgery, the order of repair for the rotator cuff muscles is crucial to minimize complications and optimize outcomes. The supraspinatus tendon is often the first to be compromised in rotator cuff tears, and repairing this tendon first may reduce the risk of further injury to the surrounding muscles.
**Correct Answer: A. Deltoid muscle is not considered part of the rotator cuff.**