Posterior interosseous nerve --------------------------------------- The posterior interosseous nerve, also known as the dorsal interosseous nerve, is the continuation of the deep branch of the radial nerve after it penetrates the supinator muscle. It carries fibres from the C7 and C8 spinal nerves, and supplies the majority of the muscles in the posterior compartment of the forearm. Gross anatomy --------------------- Origin --------- The posterior interosseous nerve continues from the deep bra

Peripheral nerve function extends beyond motor and cutaneous roles. The posterior interosseous nerve terminates in the dorsal wrist capsule and contributes innervation to the TFCC. The dorsal sensory branch of the ulnar nerve and the medial antebrachial cutaneous nerve add further afferent input. These represent part of a broader network of ligamentous and capsular afferents essential to wrist proprioception. Their continuous feedback allows the central nervous system to refine motor output, sta