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Intercostobrachial Nerve
Nervous System

Intercostobrachial Nerve

Nervus intercostobrachialis

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Origin

The lateral cutaneous branch of the second intercostal nerve is also known as the intercostobrachial nerve.

Course

The intercostobrachial nerve crosses the axilla to enter the medial arm. Here it joins the medial brachial cutaneous nerve. It pierces the deep fascia of the arm to innervate the skin.

Branches

None.

Supplied Structures & Function

The intercostobrachial nerve conveys sensory innervation from the skin of the medial and posterior forearm and arm, skin of the axilla, and skin overlying the second intercostal space. Please refer to the Foerster’s dermatome map (Foerster, 1933, Standring, 2016).

References

Foerster, O. (1933) 'The Dermatomes in Man', Brain, 56(1), pp. 1-39.

Standring, S. (2016) Gray's Anatomy: The Anatomical Basis of Clinical Practice. Gray's Anatomy Series: Elsevier Limited.

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