Mammary artery refers to any of the arteries originating from the subclavian or axillary arteries and distributing to the anterior thoracic wall, mediastinal structures, diaphragm, pectoral muscles and mammary gland. In humans, there are generally two types of mammary arteries: (1) the internal mammary artery (now referred to as the internal thoracic artery) and (1) the external mammary artery (now referred to as the lateral thoracic artery). The internal mammary arteries are a pair of arteries that supply the anterior chest wall and the breasts. The external mammary arteries are the blood vessels that supply oxygenated blood to the lateral structures of the thorax and the breast.
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