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            The teres major is a thick, rounded muscle of the shoulder joint. It is a thick but somewhat flattened muscle. Supraspinatus , Infraspinatus , Subscapularis , and Teres Minor together This Four Muscle work as rotatory to the Humerus. So, also known as Rotator Cuff. teres major ORIGIN: teres major Originates from the posterior surface of the scapula at the inferior angle. teres major INSERTION: teres major inserted at the intertubercular groove of the humerus, tendon fused with the tendon of latissimus dorsi. teres major ACTION: teres major posteromedially extends, medially rotates, & adducts arm. teres major synergist of latissimus dorsi . teres major NERVE SUPPLY: The lower scapular nerve.

                      The teres minor is a narrow, elongated muscle of the rotator cuff.                     Supraspinatus ,  Infraspinatus ,  Subscapularis , and  Teres Minor  together This Four Muscle work as rotatory to the Humerus. So, also known as  Rotator Cuff. teres minor ORIGIN: Teres minor originates from the lateral border of a dorsal scapular surface. teres minor INSERTION: Teres minor is inserted at greater tubercle of humerus, inferior to the infraspinatus teres minor ACTION: helps to hold the head of the humerus in glenoid cavity. stabilizes the shoulder joint. rotates humerus laterally. Same as Infraspinatus muscle. teres minor NERVE SUPPLY: Teres minor is Supplied by the Axillary nerve.

              The subscapularis is a large triangular muscle.  Supraspinatus ,  Infraspinatus ,  Subscapularis , and  Teres Minor  together This Four Muscle work as rotatory to the Humerus. So, also known as  Rotator Cuff. ORIGIN: The subscapularis is originated from subscapular fossa of the scapula. INSERTION: The subscapularis is inserted at lesser tubercle of the humerus. ACTION: The subscapularis is chief medial rotator of the humerus, assisted by pectoralis major . The subscapularis is helped to hold the head of a humerus in glenoid cavity, stabilizes the shoulder. NERVE SUPPLY: The subscapularis is supplied by the Subcapular nerve.

                              the infraspinatus muscle is a thick triangular muscle, which occupies the chief part of the infraspinatous fossa. As one of the four muscles of the rotator cuff. Supraspinatus, Infraspinatus, Subscapularis, and Teres Minor together This Four Muscle work as rotatory to the Humerus. so also known as Rotator Cuff . Infraspinatus ORIGIN: the infraspinatus originates from infraspinous fossa of the scapula. Infraspinatus INSERTION: the infraspinatus is inserted at greater tubercle of humerus, posterior to supraspinatus. Infraspinatus ACTION: helps to hold the head of the humerus in glenoid cavity. stabilizes the shoulder joint. rotates humerus laterally. Infraspinatus NERVE SUPPLY: the infraspinatus muscle is supplied by the Suprascapular nerve.

                           The supraspinatus (plural supraspinati) is a relatively small muscle of the upper back. Supraspinatus,Infraspinatus, Subscapularis and Teres Minor together This Four Muscle work as rotatory to the Humerus. so also known as  Rotator Cuff . Supraspinatus ORIGIN: Supraspinatus originates from supraspinous fossa of the scapula. Supraspinatus INSERTION: Supraspinatus is inserted at the superior part of greater tubercle of the humerus. Supraspinatus ACTION: Supraspinatus stabilizes the shoulder joint. Supraspinatus helps prevent downward dislocation of the humerus. Supraspinatus NERVE SUPPLY: Supraspinatus is innervated by Suprascapular nerve.