external mammary artery
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lat·er·al tho·rac·ic ar·ter·y[TA]
origin, third part of axillary; distribution, passes around lateral border of pectoral muscles, supplying them and other muscles of thoracic wall and mammary gland.
external mammary artery(1) Lateral thoracic artery.
(2) Lateral mammary branches of lateral thoracic artery.