T. Clark Brelje, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
Robert L. Sorenson, Ph.D.
University of Minnesota
Department of Genetics, Cell Biology and Development
6-160 Jackson Hall
321 Church St SE
Minneapolis, MN 55455
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MHS 218 Mammary Gland
Mammary Gland
This semi-thin section (~1.0 µm thick) of a lactating mammary gland has excellent cellular definition of the milk-secreting alveolar cells. The milk is contains abundant proteins, lipids and lactulose. The large secretion granules are easily seen in the alveolar cells.
Lobes - 15 to 20 lobes separated by septae of connective tissue with adipose cells.
Lobules - enclosed by a thin layer of connective tissue.
Alveoli (#1 and #2) - grow and expand during pregnancy and lactation.
Simple Epithelium - cuboidal or columnar secretory cells that synthesis and secrete milk.
Secretion Granules - stain pink-red and are of varying number and size. They are released apocrine secretion.
