Teres minor is a posterior muscle of the shoulder that extends between the scapula and the head of humerus. It is one of the four muscles of the rotator cuff, along with the supraspinatus, infraspinatus and subscapularis. Origin and insertion Teres minor originates from the scapula, via two heads that are separated by a groove for the circumflex scapular artery. The attachment site spans the upper two-thirds of the lateral border of scapula. The fibers quickly fuse into a single muscle belly whi