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Lateral Dorsal Cutaneous Branch of Eighth Posterior Intercostal Artery (Right)
Cardiovascular System

Lateral Dorsal Cutaneous Branch of Eighth Posterior Intercostal Artery (Right)

Ramus cutaneus dorsalis lateralis arteriae intercostalis posterioris octavae

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The lateral and medial dorsal cutaneous branches arise from the dorsal branches of posterior intercostal arteries, as it bifurcates when it passes through the costotransverse foramen (the space between the superior transverse ligament and the neck of the rib).


The lateral dorsal cutaneous branches follow the lateral branches of the posterior rami of the corresponding thoracic nerves. They travel between the superior costotransverse and intertransverse ligaments (or muscle when present), and between the longissimus and iliocostalis muscles, piercing the latissimus dorsi to become superficial.


There are no named branches.

Supplied Structures

Along their course, the lateral dorsal cutaneous branches of the posterior intercostal arteries supply the longissimus thoracis, iliocostalis, and latissimus dorsi muscles, as well as the overlying fascia and skin.

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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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