Lec 10 Reproduction 3-1

Each alveolus is lined with an inner layer of

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Unformatted text preview: d with an inner layer of secretory epithelial cells that secrete milk. A lve o li – th e p rim a ry m a m m a ry s truc ture re s p o ns ib le fo r p ro d uc ing m ilk MAMMARY GLAND STRUCTURE MAMMARY (b) Ducts Drain the alveoli. Lined with ductal epithelial cells. (c) Lobules Composed of multiple alveoli, along with the finest of the ductal units. Mammary Gland Structure Mammary End Bud Alveoli Lobules Species Differences Species Pre­pubertal heifer (Capuco et al 2000) Pre­pubertal mouse (Ellis 1998) bovine ­ tightly packed ducts murine ­ widely spaced elongated ducts MAMMARY GLAND STRUCTURE MAMMARY (d) Gland cistern Ducts drain into it. (e) Teat cistern and streak canal Channel that exits to the exterior. They open to the exterior through opening (s) in the nipple. MAMMARY GLAND STRUCTURE MAMMARY GLAND STRUCTURE MAMMARY (f) Myoepithelial cells Cover the alveoli and the ducts Smooth muscle cells that contract to facilitate milk release, or milk let-down. Mammary Gland Alveolar-Lobule Structure STAGES OF MAMMARY GLAND DEVELOPMENT DEVELOPMENT (a) Prepubertal Some general isometric growth i.e. growing at the s...
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