Montgomery glands, which secrete lubricants to lactiferous sinus nipples on the south side of the nipple yard, are the part that will drain the milk through the nipple. Lactiferous sinus opening holes are open edging closer to Montgomery's tubercles, or somewhere that opens in Montgomery tubercles from the figure, you can see that the milk created from Alveolus by Alveolus consists of gland cells around the middle tube and milk generated from those gland cells around the myoepithelial cells. After that, the milk flows along the lactiferous ducts into lactiferous sinus, the lactiferous sinus mechanism, the milk extraction mechanism, or the suckling of the baby.