The teres major muscle is a functional extension of the subscapularis muscle which lies superiorly on each side. It arises from the oval area on the dorsal surface of the scapula around its inferior angle. Its fibres run superolaterally to insert into the medial lip of the intertubercular groove of the humerus. On route, the tendon of latissimus dorsi winds around its inferior border. Together, teres major and latissimus dorsi form the posterior axillary fold.
Teres major is supplied by the lower subscapular nerve from the posterior cord of the brachial plexus (C5, C6). This enters the muscle anteriorly.
It has several actions:
Teres major bounds both the quadrangular and triangular spaces.
Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.