Muscle Anatomy

teres minor 

The teres minor muscle is situated in the posterior aspect of the shoulder, forming part of the rotator cuff. It is a relatively small and narrow muscle compared to some of the larger shoulder muscles.

Originating from the lateral border of the scapula, specifically from the upper two-thirds of the scapular border, the teres minor takes its starting point from the bony surface on the posterior aspect of the shoulder blade.

The muscle inserts into the greater tubercle of the humerus, forming a connection with the upper part of the arm bone.

Functionally, the teres minor is a crucial external rotator of the shoulder joint. It plays a key role in turning the humerus outward, contributing to the overall range of motion in the shoulder. Additionally, the muscle assists in stabilizing the shoulder joint during arm movements, providing dynamic stability and preventing dislocation. The teres minor is particularly active in actions such as throwing, reaching, and lifting, showcasing its significance in shoulder biomechanics and overall upper limb function.