origin of subscapularis
subscapular fossa of scapula
The subscapularis muscle is one of the four muscles that make up the rotator cuff in the shoulder joint. It originates from the subscapular fossa, which is a concave depression on the anterior (front) surface of the scapula bone. The subscapular fossa is located between the spine of the scapula (a bony ridge on the back of the scapula) and the glenoid cavity (the bony socket of the shoulder joint). The subscapularis muscle fibers originate from this fossa and converge as a tendon that inserts onto the lesser tubercle of the humerus (a bony prominence on the upper arm bone). The subscapularis muscle is innervated by the upper and lower subscapular nerves, which are branches of the brachial plexus. Its main function is to internally rotate the humerus and stabilize the shoulder joint.
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