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Teres Major:
Origin: Inferior angle of scapula (dorsal surface)
Inferior: Medial Lip of bicipital groove of humerus
Action: Extension
Medial rotation and addustion of humerus
Nerve: Lower subscapular nerve (Cervical 5, 6)
Palpate: From inferior angle of scapula diagonally upward toward its insertion, just above latissimus dorsi during active extension of the humerus. It joins latissimus dorsi during active extension of the humerus. It joins latissimus dorsi in forming posterior border of axilla.
This muscle inserts near latissimus dorsi and has the same actions. Together with infraspinatus and teres minor, it pulls downward to help stabilize the head of the humerus during abduction.
