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Subcostal Artery
Cardiovascular System

Subcostal Artery

Arteria subcostalis

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Origin

The subcostal arteries arise as paired branches from the posterolateral aspect of the thoracic aorta.

Course

The subcostal arteries course in a posterolateral direction along the posterior thoracic wall and enter the subcostal space of the twelfth rib. They subsequently curve to pass in an anterolateral direction. The arteries traverse the posterior edge of the transverse abdominis muscle.

The subcostal artery then continues between internal abdominal oblique and transverse abdominis and terminates close to the rectus abdominis. It is accompanied by the subcostal nerve (the anterior ramus of twelfth thoracic spinal nerve).

Branches

It gives a dorsal branch that travels posteriorly through the transverse processes of adjacent vertebrae.

Supplied Structures

The subcostal artery contributes to the muscular, fascial and cutaneous supply of the anterior, lateral and posterior abdominal wall.

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Artery

ScienceDirect image

When the artery is occluded blood is forced through the collateral vessels, drastically increasing fluid shear stress and triggering an inflammatory response which drives vessel remodeling.

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