produces mammary gland A mouse mammary gland contains a single duct or sinus, forming 5-10 secondary ducts A specialized accessory gland of the skin of mammals that secretes milk. The gland is typically only developed in females, and regresses in males. 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] BTO:0000817 Brustdruese CALOHA:TS-0595 EFO:0000854 EMAPA:17759 EV:0100125 FMA:286452 MA:0000145 MAT:0000073 MESH:D008321 MIAA:0000073 NCIT:C12367 OpenCyc:Mx4rvVjVq5wpEbGdrcN5Y29ycA Originally this was classified as a female reproductive structure, as it was in the MP in 2011 The BTO class represents the combination of nipple plus lobe 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 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] The male Dayak fruit bat has lactating mammary glands The mammary glands of humans are in the thoracid/breast region. In other mammals they may be located elsewhere on the mammary ridges. UBERON:0001911 UMLS:C0929301 VHOG:0000398 dug glandula mammaria glandula mammaria lactiferous gland lobe of breast lobe of mammary gland mamma mammae mammary milk patch uberon milk ectoderm-derived structure exocrine gland of integumental system