The ampulla are small dilatations formed by the lactiferous tubules. They serve as reservoirs for milk at the base of the nipple. These ducts increase in capacity during pregnancy and in breast- feeding the pressure of the baby's gums on the areola stimulates the milk flow. Research Ampulla
The lactiferous tubules are the small ducts through which the milk flows to the openings of the nipple in the mammary glands. The lactiferous ducts are composed of areolar tissue and elastic fibres. The number of ducts in each mammary gland varies from fifteen to twenty. These ducts increase in capacity during pregnancy and in breast-feeding the pressure of the baby's gums on the areola stimulates the milk flow. Research Lactiferous Tubules
The nipples contain the outlets of the milk ducts (lactiferous tubules). Each nipple is situated in the center of the mammary gland. It generally has a conical shape and is a light rosy colour that deepens during pregnancy. Nipples vary in size and shape and may be smooth, protruding, or inverted. The nipples enlarge during pregnancy, followed by enlargement of the entire mammary gland. The
nipples usually point upward and somewhat to the sides, a position that is believed to have evolved because it is most convenient for the sucking infant. The nipple and areola contain smooth muscle fibres that can contract in response to cold, to sexual stimulation, or to the baby's suckling, causing the areola to shrink and the nipple to become erect. The involuntary action squeezes the ducts and, during breast-feeding, helps release milk. Research Nipples
The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
Abbreviations
Research Ampulla
