<P> The basic components of a mature mammary gland are the alveoli ( hollow cavities , a few millimeters large ) lined with milk - secreting cuboidal cells and surrounded by myoepithelial cells . These alveoli join to form groups known as lobules . Each lobule has a lactiferous duct that drains into openings in the nipple . The myoepithelial cells contract under the stimulation of oxytocin , excreting the milk secreted by alveolar units into the lobule lumen toward the nipple . As the infant begins to suck , the oxytocin - mediated `` let down reflex '' ensues and the mother 's milk is secreted -- not sucked from the gland -- into the baby 's mouth . </P>
<P> The basic components of a mature mammary gland are the alveoli ( hollow cavities , a few millimeters large ) lined with milk - secreting cuboidal cells and surrounded by myoepithelial cells . These alveoli join to form groups known as lobules . Each lobule has a lactiferous duct that drains into openings in the nipple . The myoepithelial cells contract under the stimulation of oxytocin , excreting the milk secreted by alveolar units into the lobule lumen toward the nipple . As the infant begins to suck , the oxytocin - mediated `` let down reflex '' ensues and the mother 's milk is secreted -- not sucked from the gland -- into the baby 's mouth . </P>
what part of the mammary gland produces milk
what part of the mammary gland produces milk
cuboidal cells
cuboidal cells