Lateral Dorsal Cutaneous Branches of Posterior Intercostal Arteries (Left)
Rami cutanei dorsales laterales arteriae intercostalium posteriorium
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The lateral dorsal cutaneous branches arise from the dorsal branches of the posterior intercostal arteries, as it bifurcates when it passes through the costotransverse foramen. The lateral dorsal cutaneous branch follows the lateral cutaneous branch of the posterior ramus of the corresponding thoracic nerve. It travels between the superior costotransverse and intertransverse ligaments (or muscle when present). It courses between the longissimus and iliocostalis muscles supplying those muscles through its course. It pierces the trapezius or latissimus dorsi muscle to become superficial, and supplies these muscles, overlying fascia and skin.
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