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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 Coracobrachialis Muscle is a relatively small but functionally important skeletal muscle located on the medial (inner) side of the upper arm. It extends from the coracoid process of the scapula to the mid-portion of the humerus and is located in the forearm compartment. This muscle is one of the muscle groups that increase stability around the shoulder joint and facilitate certain movements of the upper extremity. It plays a particularly active role in shoulder flexion and adduction (movemen

The Rectus Abdominis Muscle is a long, flat, paired skeletal muscle located on the anterior surface of the abdominal wall. It is commonly known as the "abs" or "diamondback muscle." This bilateral muscle is separated from each other by the midline connective tissue line, the linea alba. Each muscle bundle is surrounded by a serrated connective tissue border called the linea semilunaris. The rectus abdominis originates inferiorly from the pubic symphysis, pubic crest, and pubic tubercle, and exte