Posterior compartment of the forearm

Last revised by Craig Hacking on 18 Aug 2021

The forearm is divided into the posterior compartment and the anterior compartment by the deep fascia, lateral intermuscular septum and the interosseous membrane between the ulna and radius

The posterior compartment of the forearm contains 11 muscles, divided into deep and superficial layers.

The anconeus muscle is sometimes considered part of the posterior compartment of the forearm rather than part of the posterior compartment of the arm.

Anterior and posterior interosseous arteries, which are branches of the short common interosseous artery, arise from the proximal ulnar artery.

All muscles in the extensor compartment are supplied by the radial nerve.

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