Teres major muscle
|Teres major muscle|
Teres major muscle (in red) seen from back.
|Origin||Posterior aspect of the inferior angle of the scapula|
|Insertion||Medial lip of the intertubercular sulcus of the humerus|
|Artery||Subscapular and circumflex scapular arteries|
|Nerve||Lower subscapular nerve (segmental levels C5 and C6)|
|Actions||adduct the humerus, Internal rotation (medial rotation) of the humerus, extend the humerus from flexed position, Protracts scapula, Depress shoulder|
|Latin||Musculus teres major|
|Anatomical terms of muscle|
The teres major muscle (Latin teres meaning 'rounded') is a muscle of the upper limb and one of seven scapulohumeral muscles. It is a thick but somewhat flattened muscle, innervated by the lower subscapular nerve (C5 and C6).
It arises from the oval area on the dorsal surface of the inferior angle of the scapula, and from the fibrous septa interposed between this muscle and the rotator cuff lateral rotator pair of the teres minor and infraspinatus.
The fibers of teres major insert into the medial lip of the intertubercular sulcus of the humerus.
The teres major muscle is innervated by the lower subscapular nerve of the brachial plexus.
The teres major is a medial rotator and adductor of the humerus and assists the latissimus dorsi in drawing the previously raised humerus downward and backward (extension, but not hyper extension). It also helps stabilize the humeral head in the glenoid cavity.
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