What is the proximal attachment of the teres major muscle?

The proximal attachment of the teres major muscle is indeed on the posterior surface of the inferior angle of the scapula. This specific attachment allows the muscle to perform crucial functions such as adduction and medial rotation of the humerus. The teres major works alongside other muscles in the shoulder girdle, particularly in movements that require stabilization and control of the upper limb.

This attachment position on the scapula is significant because it positions the teres major for effective leverage and movement of the arm. The other options do not accurately reflect the anatomical placement of the teres major: the clavicle relates to different shoulder muscles, the supraspinous fossa is associated with the supraspinatus muscle, and the deltoid tuberosity is the insertion point for the deltoid muscle but not relevant to the teres major's attachment. Understanding the correct origin of the teres major is essential for grasping the muscle's role in shoulder mechanics and movement.