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Anterior Cutaneous Branch of Third Intercostal Nerve (Left)
Nervous System

Anterior Cutaneous Branch of Third Intercostal Nerve (Left)

Ramus cutaneus anterior nervi intercostalis tertii

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Origin

The anterior cutaneous branch arises as the terminal branch of the third intercostal nerve.

Course

As the third intercostal nerve reaches the anterior portion of the intercostal space, the parasternal line, it pierces through the internal intercostal muscle and external intercostal membrane, and subsequently the pectoralis major muscle, as the anterior cutaneous branch.

Branches

The anterior cutaneous branches divide into medial and lateral branches that extend over the sternum and pectoralis major muscle, respectively.

Supplied Structures & Function

The anterior cutaneous branch conveys sensory information from the skin of the anterior thoracic wall. See our dermatome map for cutaneous innervation.

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Intercostal Nerve

ScienceDirect image

The intercostal nerve frequently runs within the middle of the intercostal space (73% of the time) and occasionally courses along the inferior aspect of the intercostal space just above the subjacent rib (Hardy, 1988).

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