Teres major muscle
The teres major muscle is a muscle of the shoulder that connects the
scapula (shoulder blade) to the upper arm at the
humerus
bone just beyond the armpit region.
The teres major muscle is surrounded by the teres minor and the
latissimus dorsi muscles.
Contents |
Action
The teres major muscle controls the adduction of the arm - the movement of bringing the arm in toward to the body. It helps medially rotate the arm, or being able to draw elbow in and away from the side of the body. It also
extends the arm at the shoulder allowing the arm to reach forward.
Origin
The teres major originates on the lower
scapula, at the lower
lateral border and inferior angle.
Insertion
The teres major inserts on the upper arm, at the
medial lip of the intertubercular groove of the
anterior
humerus.
Innervation
The teres major is innervated by the posterior cord of the lower subscapular nerve (C5 and C6).