The Long Head of the Triceps Brachii of a Human Male Viewed Posteriorly Beneath the Skin

Description

Originating from the infraglenoid tubercle of the scapula, the long head of triceps brachii courses inferiorly along the posteromedial aspect of the arm, forming a distinct muscular column between the teres minor superiorly and the posterior humerus laterally. Lateral and medial heads flank it, converging distally into the common triceps tendon that inserts on the olecranon of the ulna, with a superficial fascial plane and skin preserved to emphasize subcutaneous topography. Posterior compartment forearm extensors continue the line of pull beyond the elbow, and the extensor retinaculum is shown as a white transverse band stabilizing blue extensor tendons as they cross the dorsal wrist toward the digits. Color coding separates contractile muscle belly (red) from tendon and aponeurosis (blue) and connective tissue planes (white). Clear landmarks. Posterior presentation under the cutaneous covering is a practical way to teach how the long head differs from the other triceps heads in function and clinical behavior, because it crosses both the shoulder and elbow joints and can influence shoulder extension and adduction as well as elbow extension. This is the head you think about with posterior shoulder pain in overhead athletes, where proximal long head strain or scapular dyskinesis can coexist with traction on the radial nerve in the spiral groove and irritation along the lateral head region. The olecranon insertion also frames common pathology, including triceps tendinopathy and partial tears at the tendon-bone interface after a fall on a flexed elbow or during heavy pressing. Ideal for gross anatomy lab manuals, kinesiology modules on elbow extension, and surgical education around posterior approaches to the arm and elbow where the triceps and its tendon define the operative corridor. It also supports patient-facing explanations for triceps tendon injury, dorsal wrist tendon irritation under the extensor retinaculum, and posterior compartment anatomy in sports medicine reports. Anatomical accuracy verified by SciePro's Medical Advisory Board.