Bones of forearm and hand showing muscle attachments, anterior view.

Motor distribution of the radial nerve to muscles in the posterior compartment of the forearm.

Posterior view of the deep structures on extensor aspect of forearm.

Anterior view of the cubital fossa with biceps muscle excised and cubital fossa opened widely, exposing the brachialis and supinator muscles.

Section through distal carpal tunnel; for level of section, see insert (line A).

Posterior view of radial nerve innervation.

Carpal tunnel; see insert (line B) for level: HH, hook of hamate; H, hamate; C, capitate; Tz, trapezoid; Tm, trapezium. Numbers refer to structures in the area.

Transverse MRI of carpal tunnel; for level of section see insert (line C): P, pisiform; T, triquetrum; H, hamate; C, capitate; S, scaphoid. Numbers refer to structures in the area.

Extensor carpi radialis brevis m., trigger points