Anterior interosseous nerve

Author: Roberto Grujičić, MD • Reviewer: Dimitrios Mytilinaios, MD, PhD
Last reviewed: October 30, 2023
Reading time: 2 minutes

The anterior interosseous nerve is a branch of the median nerve. This tiny nerve arises from the posterior aspect of the median nerve, between the two heads of the pronator teres muscle.

While the nerve descends through the proximal forearm, it courses between the flexor pollicis longus and flexor digitorum profundus muscles. It travels alongside the anterior interosseous artery.

In the distal forearm, the nerve courses adjacent to the pronator quadratus muscle and terminates by giving off small terminal branches around the wrist joint.

The main function of the anterior interosseous nerve is to supply the muscles of the forearm including the:

Flexor pollicis longus muscle
Lateral aspect of the flexor digitorum profundus muscle
Pronator quadratus muscle

In addition, it provides innervation for the distal radioulnar, radiocarpal and some intercarpal joints.

Terminology	English: Anterior interosseous nerve Latin: Nervus interosseous anterior
Definition	The anterior interosseous nerve is a posterior branch of the median nerve located in the forearm.
Innervation	Flexor pollicis longus muscle, flexor digitorum profundus, pronator quadratus muscle, distal radioulnar joint, radiocarpal joint and some intercarpal joints.

Learn more about the neurovasculature of the forearm with the following study unit:

Sources

All content published on Kenhub is reviewed by medical and anatomy experts. The information we provide is grounded on academic literature and peer-reviewed research. Kenhub does not provide medical advice. You can learn more about our content creation and review standards by reading our content quality guidelines.

Drake, R., Vogl, W., Mitchell, A. & Gray, H. (2015). Gray's anatomy for students. Philadelphia, PA: Churchill Livingstone/Elsevier.
McKinley, M. & Loughlin, V. (2012). Human anatomy. New York: McGraw-Hill.
Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). Clinically Oriented Anatomy (7th ed.). Philadelphia, PA: Lippincott Williams & Wilkins.
Standring, S. (2016). Gray's Anatomy (41st ed.). Edinburgh: Elsevier Churchill Livingstone

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Anterior interosseous nerve

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