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Intercostobrachial nerve

Nerve providing sensation to armpit and upper arm

Summary

Nerve providing sensation to armpit and upper arm

Field	Value
Name	Intercostobrachial nerve
Latin	nervi intercostobrachiales
Image	Nerves_of_the_left_upper_extremity.gif
Caption	Nerves of the left upper extremity. (Intercostobrachial nerve visible near top center.)
BranchFrom	Intercostal nerves #2 and #3

The intercostobrachial nerve is the name applied to the lateral cutaneous branch of the second intercostal nerve. It arises anterior to the long thoracic nerve. It provides sensory innervation to the skin of the axilla, and a variable region of the medial side of the upper arm.****

Anatomy

The lateral cutaneous branch of the second intercostal nerve does not divide like other intercostal nerves into an anterior and a posterior branch.

Course

It pierces the intercostalis externus muscle and the serratus anterior muscle, crosses the axilla to the medial side of the arm, and joins with a filament from the medial brachial cutaneous nerve. It then pierces the fascia, and supplies the skin of the upper half of the medial and posterior part of the arm, communicating with the posterior brachial cutaneous branch of the radial nerve.

Relations

The size of the intercostobrachial nerve is in inverse relationship to that of the medial brachial cutaneous nerve.

Variation

An additional intercostobrachial nerve is frequently given off from the lateral cutaneous branch of the third intercostal nerves; it supplies filaments to the axilla and medial side of the arm.

Clinical significance

It is often the source of referred cardiac pain.

The intercostobrachial nerve is sometimes divided in axillary node clearance (ANC), such as that done for breast cancer surgery which requires the removal of the axillary nodes. Sensation to the cutaneous region supplied by the nerve is affected.

Additional images

File:Gray811and813.PNG|Cutaneous nerves of right upper extremity. File:Gray812and814.svg|Diagram of segmental distribution of the cutaneous nerves of the right upper extremity. File:Innervation oberarm.gif|Innervation

References

Sinnatamby, Chummy. (2011). "Last's Anatomy".

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

spinal-nerves thoracic-nerves

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