http://upload.wikimedia.org/wikipedia/commons/6/64/Illu_breast_anatomy.jpg

Originally this was classified as a female reproductive structure, as it was in the MP in 2011

Any of the milk-producing apocrine glands typically occurring in pairs in female mammals and consisting of lobes containing clusters of alveoli with a system of ducts to convey the milk to an external nipple or teat. [TFD][VHOG]

The FMA class represents an individule lobe. The nipple is not a part, The MA class represents a composite structure, including the nipple, fat, connective tissue, smooth muscle as parts, The BTO class represents the combination of nipple plus lobe

milk patch, lobe of breast

uberon

mamma, mammae, dug, Brustdruese, glandula mammaria, lobe of mammary gland

mammary

The detailed similarities of mammary glands in living monotremes, marsupials, and eutherians argue for a monophyletic origin of these glands, perhaps by the combination of parts of preexisting sebaceous and sweat glands.[well established][VHOG]

UBERON:0001911

The mammary glands of humans are in the thoracid/breast region. In other mammals they may be located elsewhere on the mammary ridges., The male Dayak fruit bat has lactating mammary glands, A mouse mammary gland contains a single duct or sinus, forming 5-10 secondary ducts

• epithelium of mammary gland
• mammary gland connective tissue
• lobule of mammary gland
• areola

• mammary gland fluid/secretion

• mammary ridge

• epithelium of mammary gland
• mesenchyme of mammary gland
• mammary gland connective tissue
• lobule of mammary gland
• areola
• mammary gland smooth muscle
• parenchyma of mammary gland