Plate 13.256 Mammary Gland
Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Paul M. Heidger,
Peer Review Status: Externally Peered Reviewed
Monkey, 10% formalin, H. & E., 6.5 x.
The lactiferous ducts (galactophores) empty independently upon the surface of the nipple, imparting a serrated, pitted apprearance to the nipple surface. The openings of the ducts are lined with stratified squamous epithelium, keratinizing variety, which is continuous with that of the skin. The ductal orifices contain a keratinous cell debris. At the base of the nipple, the lactiferous ducts expand into large lactiferous sinuses; these, in turn, give rise to the lobular ductal system of the gland. This specimen is from the first trimester of pregnancy, and the mammary tissue is not well developed. During suckling, it is not uncommon for a lactiferous duct to become blocked and painfully engorged.
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