Forearm, Posterior View

Description

Posterior antebrachium anatomy is presented with emphasis on the extensor compartment as it spans from the lateral epicondyle region toward the dorsum of the wrist. Along the dorsolateral border, the radius lies lateral to the ulna, with the subcutaneous posterior border of the ulna forming a medial landmark from proximal to distal. Superficial muscle masses consistent with extensor carpi radialis longus and brevis, extensor digitorum, extensor carpi ulnaris, and the obliquely oriented brachioradialis contour are expected, tapering distally into tendinous structures approaching the extensor retinaculum. Posterior forearm relationships matter in lateral epicondylitis and in planning safe approaches around the radial tunnel, where the posterior interosseous nerve passes through the supinator and can be compressed. Surface anatomy in this view also supports teaching of the dorsal wrist extensor compartments, a frequent point of confusion when correlating palpation, ultrasound, and dorsal wrist injections. Clear laterality of radius versus ulna helps orient trainees to tendon paths that cross the wrist obliquely, such as extensor pollicis longus around Lister’s tubercle. Designed for upper-limb anatomy teaching in gross anatomy, kinesiology, and physical therapy modules, this posterior view also suits orthopedic and sports medicine materials discussing extensor tendinopathy and radial nerve entrapment. It integrates well into patient-facing education on posterior forearm pain patterns while preserving accurate skin tone representation in an adult Black male model. Anatomical accuracy verified by SciePro's Medical Advisory Board.