Current conceptUnusual Compression Neuropathies of the Forearm, Part I: Radial Nerve
Section snippets
Compression Syndromes of the Posterior Interosseous Nerve
The PIN is thought of as a “motor-only” nerve that travels through the radial tunnel. The radial tunnel is a potential space 3 to 4 finger breadths long, lying along the anterior aspect of the proximal radius through which the PIN travels. The floor of the radial tunnel is created by the capsule of the radiocapitellar joint, which continues as the deep head of the supinator muscle. Anatomically, there are 5 potential sites of compression of the PIN in the area of the radial tunnel: (1) fibrous
Compression of the Superficial Radial Nerve (SRN)
The SRN is the superficial sensory branch of the radial nerve. After the radial nerve bifurcates into the SRN and PIN, the SRN courses distally into the forearm deep to the brachioradialis. Approximately 9 cm proximal to the radial styloid, the SRN becomes a subcutaneous structure by traveling between the brachioradialis and ECRL tendons (Fig. 2).74 The SRN continues to travel in the subcutaneous tissues and branches out into dorsal digital nerves responsible for afferent sensory input from the
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