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Summary Human Mouse

2.1.3. Structure of Lactation

With pregnancy, the TDLUs increase to fill the mammary fat pad. The now terminally differentiated acini produce milk proteins, lipid and other products.

5 x				4 x
	Pregnancy hormones induce hyperplasia of TDLU. In this slide from a 5 months pregnancy the enlarged lobules have crowded out the extralobular connective tissue.		Low magnification image of a lactating mammary gland of a young woman. Note that the alveoli fill the entire mammary gland without evidence of residual fat cells.
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	Low magnification image of a lactating mammary gland of a young woman.		Image of a lactating mammary gland of a young woman. Note that the lumens are filled with a proteinaceous fluid with clear lipid vacuoles. The epithelium is attenuated, simple squamous.