Anterior Interosseous Nerve: Difference between revisions
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== Introduction == | == Introduction == | ||
The anterior interosseous nerve, also known as the volar interosseous nerve, is a motor branch that comes off of the median nerve in the proximal forearm. Compression of this nerve can occur at various sites along its course in the forearm. | The anterior interosseous nerve, also known as the volar interosseous nerve, is a motor branch that comes off of the median nerve in the proximal forearm. Compression of this nerve can occur at various sites along its course in the forearm. | ||
== Structure & Origin == | |||
The anterior interosseous nerve arises off the posterior surface of the median nerve in the proximal forearm, approximately 5-8cm distal to the lateral epicondyle of the humerus. | |||
It is comprised of the C5-T1 spinal nerve roots. | |||
== Course == | == Course == | ||
After branching off the median nerve in the proximal forearm, the anterior interosseous nerve courses distally between the two heads (superficial & deep) of the pronator teres muscle, deep to the flexor digitorum superficialis. It continues its descent along the anterior aspect of the interosseous membrane, between the flexor digitorum profundus and flexor pollicis longus muscles | After branching off the median nerve in the proximal forearm, the anterior interosseous nerve courses distally between the two heads (superficial & deep) of the pronator teres muscle, deep to the flexor digitorum superficialis. It continues its descent along the anterior aspect of the interosseous membrane, between the flexor digitorum profundus and flexor pollicis longus muscles. | ||
The anterior interosseous nerve passes deep to the pronator quadratus muscle, terminating close to the wrist joint. | |||
== Branches & Supply == | == Branches & Supply == | ||
The anterior interosseous nerve provides '''motor innervation''' to the deep muscles in the anterior compartment of the forearm, including: | The anterior interosseous nerve provides '''motor innervation''' to the deep muscles in the anterior compartment of the forearm, including: | ||
* Flexor pollicis longus | * Flexor pollicis longus | ||
* Flexor digitorum profundus | * Flexor digitorum profundus - lateral aspect only (the medial aspect of this muscle is supplied by the ulnar nerve). | ||
* Pronator quadratus. | * Pronator quadratus. | ||
The terminal branch of the anterior interosseous nerve travels through the posterior surface of the pronator quadratus, where it also provides sensory branches to the carpal bones of the wrist <ref name=":0">Caetano EB, Vieira LA, Sabongi Neto JJ, Caetano MB, Sabongi RG. [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6147764/pdf/main.pdf Anterior interosseous nerve: anatomical study and clinical implications]. Revista brasileira de ortopedia. 2018 Oct;53(5):575-81.</ref>. | |||
== Relations == | == Relations == | ||
As the anterior interosseous nerve | Initially, the anterior interosseous nerve sits parallel to the median nerve. As it travels into the distal forearm, it is positioned between two muscles: the flexor pollicis longus laterally and the flexor digitorum profundus medially. The anterior interosseous nerve continues to descend along the anterior aspect of the interosseous membrane where it is accompanied by the anterior interosseous artery and correlating veins <ref name=":0" />. | ||
== Anatomical Variants == | == Anatomical Variants == | ||
considerable variation in the proportion in which the median and ulnar nerves supply the flexor digitorum profundus. | |||
== Clinical Significance == | == Clinical Significance == | ||
Revision as of 16:08, 22 April 2021
This article or area is currently under construction and may only be partially complete. Please come back soon to see the finished work! (4/18/2021)
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This article or area is currently under construction and may only be partially complete. Please come back soon to see the finished work! (4/18/2021)
Introduction[edit | edit source]
The anterior interosseous nerve, also known as the volar interosseous nerve, is a motor branch that comes off of the median nerve in the proximal forearm. Compression of this nerve can occur at various sites along its course in the forearm.
Structure & Origin[edit | edit source]
The anterior interosseous nerve arises off the posterior surface of the median nerve in the proximal forearm, approximately 5-8cm distal to the lateral epicondyle of the humerus.
It is comprised of the C5-T1 spinal nerve roots.
Course[edit | edit source]
After branching off the median nerve in the proximal forearm, the anterior interosseous nerve courses distally between the two heads (superficial & deep) of the pronator teres muscle, deep to the flexor digitorum superficialis. It continues its descent along the anterior aspect of the interosseous membrane, between the flexor digitorum profundus and flexor pollicis longus muscles.
The anterior interosseous nerve passes deep to the pronator quadratus muscle, terminating close to the wrist joint.
Branches & Supply[edit | edit source]
The anterior interosseous nerve provides motor innervation to the deep muscles in the anterior compartment of the forearm, including:
- Flexor pollicis longus
- Flexor digitorum profundus - lateral aspect only (the medial aspect of this muscle is supplied by the ulnar nerve).
- Pronator quadratus.
The terminal branch of the anterior interosseous nerve travels through the posterior surface of the pronator quadratus, where it also provides sensory branches to the carpal bones of the wrist [1].
Relations[edit | edit source]
Initially, the anterior interosseous nerve sits parallel to the median nerve. As it travels into the distal forearm, it is positioned between two muscles: the flexor pollicis longus laterally and the flexor digitorum profundus medially. The anterior interosseous nerve continues to descend along the anterior aspect of the interosseous membrane where it is accompanied by the anterior interosseous artery and correlating veins [1].
Anatomical Variants[edit | edit source]
considerable variation in the proportion in which the median and ulnar nerves supply the flexor digitorum profundus.
Clinical Significance[edit | edit source]
Anterior Interosseous Nerve Syndrome[edit | edit source]
Anterior interosseous nerve syndrome refers to compression of the anterior interosseous nerve, which may occur along it's path in the anterior forearm. The most common location
Resources[edit | edit source]
- bulleted list
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- numbered list
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References[edit | edit source]
- ↑ 1.0 1.1 Caetano EB, Vieira LA, Sabongi Neto JJ, Caetano MB, Sabongi RG. Anterior interosseous nerve: anatomical study and clinical implications. Revista brasileira de ortopedia. 2018 Oct;53(5):575-81.
