dorsal branches of first and second posterior intercostal artery
branches of the first and second posterior intercostal arteries that arise as branches of the supreme intercostal artery. The distribtuion is the same as for the dorsal branches of the other posterior intercostal arteries at the T1–T2 vertebral level.
Synonym(s): rami dorsales arteriarum intercostalium posteriorum primae et secundaeTA, dorsal branches of the superior intercostal artery, rami dorsales arteriae intercostalis supremae
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