Teres major muscle
|Teres major muscle|
|Posterior view showing the relations between teres major muscle (in red) and the other muscles connecting the upper extremity to the vertebral column.|
|Teres major muscle (in red) seen from back.|
|Latin||Musculus teres major|
|Gray's||subject #123 442|
|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||Internal rotation (medial rotation) of the humerus|
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).
Origin and insertion
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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