What is the proximal attachment location of the teres minor muscle?

The teres minor muscle primarily attaches to the middle part of the lateral border of the scapula. This location is significant because it allows the teres minor to play a key role in the rotation of the arm. Specifically, this muscle is involved in the external rotation and adduction of the arm at the shoulder joint, and its attachment on the lateral border provides the necessary leverage for these actions.

The lateral border of the scapula is the region where the muscle fibers originate, and from there, they extend laterally to insert onto the greater tubercle of the humerus. This anatomical feature is crucial for understanding the functional movement of the shoulder, particularly in activities that require arm rotation.