Posterior Antebrachial Cutaneous Nerve, Anterior View

Description

Arising from the radial nerve in the posterior compartment of the arm, the posterior antebrachial cutaneous nerve is traced from its high-arm separation point and then followed distally toward the elbow and dorsal-lateral forearm, even though the overall figure is oriented from an anterior viewing position. The nerve courses superficially as it approaches the lateral epicondylar region, maintaining a relationship lateral to the humeral shaft and then along the radius-side of the antebrachium. Surrounding skeletal landmarks anchor the pathway, including the clavicle and scapula proximally, the humerus through the brachium, and the radius, ulna, metacarpals, and phalanges distally. Clinically, this branch matters because it carries cutaneous sensation from the posterior forearm and can be injured where the radial nerve is vulnerable, including the spiral groove region and near the lateral elbow during trauma or operative exposure. Clear identification helps when teaching the sensory consequences of radial nerve lesions, separating a high radial nerve injury from a more distal posterior interosseous neuropathy, which spares cutaneous sensation. Sensory only. Medical educators will find this layout useful for upper limb anatomy blocks, peripheral nerve mapping sessions, and exam figures that require students to connect a named cutaneous branch to a realistic skeletal scaffold from thorax to hand. Medical authors and clinicians can also adapt it for operative anatomy discussions around lateral arm and elbow approaches, injection sites, and post-fracture sensory documentation in the radial nerve territory. Anatomical accuracy verified by SciePro's Medical Advisory Board.