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The Teres Major Muscle is a thick, flat muscle belonging to the scapulohumeral muscle group of the upper extremity. It lies between the scapula and humerus, contributing primarily to extension and medial rotation of the humerus. While it can be confused with the rotator cuff muscles, it differs from this group by not attaching to the shoulder joint capsule. Anatomy Morphology and Connection Points The teres major muscle originates from the dorsal surface of the inferior angle of the scapula and

The Supraspinatus Muscle originates from the supraspinous fossa at the top of the scapula (shoulder blade) and extends to the greater tubercle of the humerus. It is one of the four muscles of the rotator cuff and plays a critical role in initiating abduction (raising) of the arm from the shoulder. Anatomy Morphology and Connection Points The Supraspinatus Muscle originates from the medial two-thirds of the supraspinous fossa of the scapula. After passing over the spine of the scapula, its fibers