Which muscle inserts at the intertubercular groove of the humerus?

Which muscle inserts at the intertubercular groove of the humerus?

• A. Teres Major
• B. Supraspinatus
• C. Subscapularis
• D. Brachioradialis

Answer: (A)

The intertubercular groove is a key insertion site along the humerus where several shoulder muscles anchor, organizing how they move the arm. The tendon of the teres major attaches specifically to the medial lip of this groove, which places it to assist with adduction, extension, and medial rotation of the humerus. That precise insertion location is what makes teres major the correct choice.

In contrast, the supraspinatus attaches to the greater tubercle, the subscapularis to the lesser tubercle, and the brachioradialis inserts on the distal radius—none of which involve the intertubercular groove.