interosseousnerven
Interosseousnerven, or interosseous nerves, refers to two motor nerves in the forearm: the anterior interosseous nerve (AIN) and the posterior interosseous nerve (PIN). The AIN is a branch of the median nerve in the proximal forearm and runs on the surface of the interosseous membrane. The PIN is the continuation of the deep branch of the radial nerve after it passes through the supinator. Both nerves are primarily motor and carry little to no cutaneous sensation.
The anterior interosseous nerve supplies the deep flexor group: flexor pollicis longus, the lateral part of
The posterior interosseous nerve supplies most of the extensor muscles in the posterior forearm, including extensor
Clinical relevance: injury or entrapment of the AIN causes anterior interosseous syndrome, characterized by weakness of