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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

Scalene Muscles are three muscle groups located in the deep layer of the neck that function in movement of the upper ribs, lateral flexion of the neck, and respiratory support. They are classified as anterior (scalenus anterior), middle (scalenus medius), and posterior (scalenus posterior). A fourth variant, scalenus minimus, may occasionally be present. Anatomical Structure Morphology and Attachment Points The scalene muscles consist of three primary muscles located laterally in the neck, origi