Normal: They are made of glands, rolled-up tubes of epithelium (surface-covering cells) that are available to make mucus. The lobules are the units that can make milk when it's time, and they are connected by the 14 or so ducts that normally lead out the nipple. Men may have some development of large and small ducts especially around puberty but almost never lobules.
Answered 3/1/2013
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