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Lateral Cutaneous Branch of Second Posterior Intercostal Artery (Left)
Cardiovascular System

Lateral Cutaneous Branch of Second Posterior Intercostal Artery (Left)

Ramus cutaneous lateralis arteriae intercostalis posterior secundae

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The lateral cutaneous branch arises from the posterior intercostal artery in the region of the midaxillary line. They are less significant in the upper three intercostal spaces.


The lateral cutaneous branch, accompanied by a corresponding vein and nerve, pierces the intercostal muscles to emerge between the digits of serratus anterior and external abdominal oblique muscles to reach the skin.


The lateral cutaneous branch divides into posterior and anterior rami which extend anteriorly and posteriorly along the lateral thoracic wall.

Supplied Structures

The lateral cutaneous branches of the posterior intercostal arteries supply the skin of the lateral thoracic wall.

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