Lactation is the process by which milk is synthesized and secreted from the mammary glands of the postpartum female breast in response to an infant sucking at the nipple. Breast milk provides ideal nutrition and passive immunity for the infant, encourages mild uterine contractions to return the uterus to its pre-pregnancy size i. Mammary glands are modified sweat glands. The non-pregnant and non-lactating female breast is composed primarily of adipose and collagenous tissue, with mammary glands making up a very minor proportion of breast volume.
Anatomy of the breast
Nipple - Wikipedia
The physiology of the normal human breast: an exploratory study
The nipple is a raised region of tissue on the surface of the breast from which, in females, milk leaves the breast through the lactiferous ducts to feed an infant. The nipple is surrounded by the areola , which is often a darker color than the surrounding skin. Nipple or teat can also be used to describe the flexible mouthpiece of a baby bottle. In humans, nipples of both males and females can be stimulated as part of sexual arousal.
The medical name for breast is mammary gland. Each breast consists of tissue overlying the chest wall muscles the pectoral muscles. In women, the breasts are composed principally of specialised tissue glandular tissue that produces milk. The remaining part is made up of fatty tissue. In humans, breast tissue begins to enlarge at puberty.