Teres Major

Teres Major The structure indicated is the teres major muscle. The teres major muscle is located in the posterior scapular area. It originates on the inferior angle of the scapula and inserts anteriorly on the humerus on the intertubercular sulcus. Contraction of the teres major causes extension and medial rotation of the humerus at the glenohumeral joint. Origin:  Inferior angle of scapula Insertion: Medial portion of intertubercular sulcus of humerus Action: Adduction, medial rotation, extension of humerus Innervation: Lower subscapular nerve The pectoralis major inserts on the lateral part of the intertubercular sulcus and the latissimus dorsi inserts on the …

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