Teres Major originates on the dorsal aspect of the inferior angle of the scapula and inserts on the medial lip of the intertubercular groove of the humerus. Teres Major can internally rotate and adduct the arm.
The teres major muscle is considered to be antagonistic to the teres minor muscle. The teres major muscle is a larger muscle located in the upper arm that works to extend, medially rotate, and adduct the arm, while the teres minor muscle is a smaller muscle that works to laterally rotate the arm.
The teres major muscle functions in both adduction and medial rotation of the humerus. The antagonists of this muscle are those which abduct the humerus and rotate it externally. The infraspinatus, posterior deltoid, and teres minor all function as antagonists of the teres major.
The muscle of the pectoralis is antagonist to the latissimus dorsi during the shoulder adduction. The anterior fibers are involved in shoulder abduction when the shoulder is externally rotated.
The antagonist for the supinator muscle is the pronator teres muscle. These muscles work in opposition to each other to produce rotation of the forearm.
The pronator teres and pronator quadratus
There are more than one: The deltoid, supraspinatus, infraspinatus, teres major and minor and the subscapularis.
It is the middle deltoidIt is the Deltoid Muscle .
Teres major muscle
The antagonist for the brachioradialis muscle is the pronator teres. It helps to produce opposite movements at the elbow joint, with the brachioradialis mainly responsible for elbow flexion and the pronator teres for elbow extension.
The antagonist of teres minor is: To medial rotation: latissimus dorsi, long head of triceps, pectoralis major, subscapularis. In Extension of humerus: latissimus dorsi, posterior deltoid and long head of triceps
Teres major
The teres major muscle is innervated by the lower subscapular nerve, which arises from the posterior cord of the brachial plexus (C5-C8).