Lateral Cutaneous Branch of Fourth Posterior Intercostal Artery (Left)
Ramus cutaneous lateralis arteria intercostalis posterior quarta
Read moreQuick Facts
Origin: Posterior intercostal artery.
Course: Pierces the intercostal muscles to reach the skin.
Branches: Anterior and posterior rami.
Supplied Structures: Skin of the thoracic wall.
Related parts of the anatomy
Origin
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.
Course
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.
Branches
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.
