Mammary glands are specialized organs in mammals that produce milk to nourish their young. These glands are primarily found in females, although males also have them, but they do not typically produce milk. The milk is produced in response to hormonal changes, especially during pregnancy and after childbirth. The structure of mammary glands includes lobules, which contain milk-producing cells called alveoli. When a baby suckles, nerve signals stimulate the release of hormones like oxytocin and prolactin, promoting milk ejection and production. This process is essential for the growth and development of mammalian offspring.