Anatomy of deep branch of the radial nerve Or posterior interosseous nerve; Origin, Course, Supply скачать в хорошем качестве

Anatomy of deep branch of the radial nerve Or posterior interosseous nerve; Origin, Course, Supply

The deep branch of the radial nerve is a significant nerve in the forearm, primarily responsible for motor innervation to the extensor muscles. Here’s a detailed look at its anatomy: Origin Radial Nerve: The deep branch arises from the radial nerve in the forearm. The radial nerve itself originates from the brachial plexus, with contributions from the C5 to T1 spinal nerves. Course Proximal Forearm: After branching off from the radial nerve, the deep branch passes between the two heads of the supinator muscle. Supinator Muscle: It then winds around the lateral side of the radius within the supinator canal (also known as the Arcade of Frohse). Posterior Forearm: It emerges from the supinator muscle to enter the posterior compartment of the forearm. Innervation Muscles: The deep branch of the radial nerve innervates the following muscles: Supinator Extensor carpi radialis brevis Extensor digitorum Extensor digiti minimi Extensor carpi ulnaris Abductor pollicis longus Extensor pollicis brevis Extensor pollicis longus Extensor indicis Sensory Function: Unlike the superficial branch of the radial nerve, the deep branch is primarily motor and does not provide sensory innervation. Clinical Significance Radial Tunnel Syndrome: Compression of the deep branch of the radial nerve in the radial tunnel can cause pain and weakness in the forearm and hand. Posterior Interosseous Nerve Syndrome (PINS): As the deep branch continues and changes its name to the posterior interosseous nerve, it can be compressed, leading to motor deficits in the extensor muscles. Understanding the anatomy of the deep branch of the radial nerve is crucial for diagnosing and managing conditions that affect motor function in the forearm and hand. Would you like more information on any specific aspect of this nerve or related conditions? radialnerve