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Muscular Branch of Median Nerve to Flexor Pollicis Longus (Left)
Nervous System

Muscular Branch of Median Nerve to Flexor Pollicis Longus (Left)

Ramus musculi flexor pollicis longi nervi mediani

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The median nerve gives off an anterior interosseous nerve, which is the main branch of the median nerve in the forearm. The muscular branch to flexor pollicis longus contains motor neurons from the C7—C8 cervical spinal segments.


After passing between the two heads of pronator teres muscle, the median nerve 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 antebrachial interosseous nerve which innervates the deep muscles in the anterior compartment of the forearm as it descends on the surface of the interosseous membrane. The muscular branches given off from the anterior interosseous nerve are issued to the following muscles: flexor pollicis longus, flexor digitorum profundus, and pronator quadratus.


There are no named branches.

Supplied Structures

The muscle branch of median nerve to flexor pollicis longus provides motor innervation to flexor pollicis longus muscle.

List of Clinical Correlates

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


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

Learn more about this topic from other Elsevier products

Median Nerve

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The median nerve is a terminal branch nerve of the brachial plexus formed from the medial and lateral cords.

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