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Anterior Interosseous Nerve of Forearm
Nervous System

Anterior Interosseous Nerve of Forearm

Nervus interosseus anterior antebrachii

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Origin

The anterior interosseous nerve of the forearm is the main branch of the median nerve in the forearm. It arises from the median nerve as it passes between the two heads of pronator teres muscle. It contains motor nerve fibers from the C7—C8 cervical spinal segments.

Course

Inside the cubital fossa, the median nerve lies medial to the brachial artery, behind the bicipital aponeurosis and in front of brachialis muscle. It then enters the forearm by passing between the two heads of pronator teres muscle and descends beneath the fibrous arch of the flexor digitorum superficialis muscle, on the surface of the flexor digitorum profundus. Here, in the upper part of the forearm, the median nerve gives off a deep branch called the anterior interosseous nerve which innervates the deep muscles in the anterior compartment of the forearm. The anterior interosseous nerve ends by supplying the distal radioulnar and radiocarpal (wrist) joints.

Branches

The anterior interosseous nerve of the forearm supplies muscular branches to the deep muscles of the anterior forearm. Articular branches are given off to the distal radioulnar and wrist joints.

Supplied Structures

The anterior interosseous nerve of the forearm supplies flexor pollicis longus, lateral half of flexor digitorum profundus (giving rise to tendons for the index and middle fingers), and pronator quadratus muscle. The articular branches supply the distal radioulnar and wrist joints.

List of Clinical Correlates

—Anterior interosseous nerve syndrome (Chi and Harness, 2010)

References

Chi, Y. and Harness, N. G. (2010) 'Anterior Interosseous Nerve Syndrome', Journal of Hand Surgery, 35(12), pp. 2078-2080.

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Anterior Interosseous Nerve

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47 The anterior interosseous nerve is a motor nerve which is a branch of the median nerve with its origin just distal to the pronator teres.

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