The insertion of the supraspinatus muscle is on the:

• A. Greater tubercle of the humerus (superior facet)
• B. Intertubercular (bicipital) groove of the humerus
• C. Lesser tubercle of the humerus
• D. Medial epicondyle of the humerus

Answer: (A)

Verified step by step guidance

1. Step 1: Understand the anatomy of the supraspinatus muscle, which is one of the four rotator cuff muscles located in the shoulder region.
2. Step 2: Recall that the supraspinatus originates from the supraspinous fossa of the scapula and its tendon passes under the acromion to attach to the humerus.
3. Step 3: Identify the specific bony landmarks on the humerus where rotator cuff muscles insert. The greater tubercle of the humerus has three facets: superior, middle, and inferior.
4. Step 4: Know that the supraspinatus muscle inserts on the superior facet of the greater tubercle of the humerus, which allows it to assist in abduction of the arm.
5. Step 5: Differentiate this from other insertion points such as the lesser tubercle (for subscapularis) and the intertubercular groove (for the long head of the biceps brachii), confirming the correct insertion site.