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Lateral Antebrachial Cutaneous Nerve
Nervous System

Lateral Antebrachial Cutaneous Nerve

Nervus cutaneus lateralis antebrachii

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Origin

The lateral antebrachial cutaneous nerve (or lateral cutaneous nerve of the forearm) is a continuation of the musculocutaneous nerve in the distal arm. It contains sensory nerve fibers for the C5—C7 spinal segments.

Course

The lateral antebrachial cutaneous nerve emerges from the lateral intermuscular septum between the biceps brachii and brachialis muscles, traveling from medial to lateral. It pierces the deep fascia in the roof of the cubital fossa, lateral to the biceps tendon and deep to the cephalic vein, about 2–3 cm above the bend of the elbow. The nerve further descends along the radial border of forearm down to the wrist where it lies anterior to the radial artery.

Branches

The lateral antebrachial cutaneous nerve gives off filaments that extend to the thenar eminence as cutaneous rami.

Supplied Structures

The lateral antebrachial cutaneous nerve provides cutaneous sensory innervation to skin of lateral forearm.

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Cutaneous Nerve

ScienceDirect image

The medial antebrachial cutaneous nerve is a pure sensory nerve that originates from the medial cord of the brachial plexus and innervates the skin of the medial forearm.

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