Where does the subscapularis insert?

Where does the subscapularis insert?

• A. Lesser tubercle
• B. Greater tubercle
• C. Intertubercular groove
• D. Deltoid tuberosity

Answer: (A)

The subscapularis inserts on the lesser tubercle of the humerus, on its anterior surface. This placement makes it the primary internal rotator of the arm and helps stabilize the humeral head against the glenoid. The lesser tubercle is the landmark for this muscle’s tendon. In contrast, the greater tubercle is the insertion site for the other rotator cuff muscles (supraspinatus, infraspinatus, teres minor), the intertubercular groove houses the tendon of the long head of the biceps, and the deltoid tuberosity is where the deltoid inserts.

The subscapularis inserts on the lesser tubercle of the humerus, on its anterior surface. This placement makes it the primary internal rotator of the arm and helps stabilize the humeral head against the glenoid. The lesser tubercle is the landmark for this muscle’s tendon.

In contrast, the greater tubercle is the insertion site for the other rotator cuff muscles (supraspinatus, infraspinatus, teres minor), the intertubercular groove houses the tendon of the long head of the biceps, and the deltoid tuberosity is where the deltoid inserts.