Triceps Muscle, Posterior View

Description

Posterior arm anatomy is centered on the triceps brachii, with the long head positioned medially and arising from the infraglenoid tubercle of the scapula, while the lateral head forms the bulk of the posterolateral brachium and the medial head sits deep, becoming more apparent distally near the elbow. Distally, all three heads converge into the triceps tendon inserting on the olecranon of the ulna, with the anconeus lying inferolateral to the tendon at the posterior elbow. Superiorly, the long head helps define the posterior axillary fold alongside teres major and latissimus dorsi, and it lies medial to the deltoid as the arm transitions into the scapular region. Elbow extension is the headline action, but the posterior view also frames relationships that matter in trauma and surgery: the radial nerve and profunda brachii artery course in the radial groove of the humerus deep to the lateral head, a frequent site of neuropraxia with midshaft humeral fractures. This is the surgical corridor. Triceps splitting or triceps-sparing posterior approaches to the distal humerus and elbow arthroplasty depend on recognizing the long head as a medial boundary and protecting the nerve as it pierces the lateral intermuscular septum to enter the anterior compartment. Triceps tendon rupture at the olecranon, often after a fall on an outstretched hand or in patients with renal disease, also reads cleanly when you can visualize the tendon’s broad distal footprint. Use this asset for upper limb dissection guides, orthopedic and sports medicine texts covering posterior elbow approaches, and patient education on triceps strain and tendon injury patterns. It also fits lecture slides for kinesiology and functional anatomy when you need clear head-to-tendon continuity in a posterior arm view. Anatomical accuracy verified by SciePro's Medical Advisory Board.