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Deep Part of Posterior Compartment of Forearm (Left)
Muscular System

Deep Part of Posterior Compartment of Forearm (Left)

Pars profunda compartimenti posterioris antebrachii

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Description

The muscles of the deep part are one of two subgroups of the muscles of the posterior compartment of the forearm, the other being the muscles of the superficial part. These muscles mainly act to:

- supinate the forearm at the radioulnar joints;

- extend the thumb and index finger at their interphalangeal and metacarpophalangeal joints;

- abduct the thumb at the first carpometacarpal joint.

The muscles of the deep part of the posterior compartment of the forearm consist of the:

- abductor pollicis longus;

- extensor indicis;

- extensor pollicis brevis;

- extensor pollicis longus;

- supinator.

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Forearm

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In the antebrachium the radius is the anteromedial bone, and the ulna is the posterolateral bone.

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