Fig 29, NR-6-b, Mammary gland, Active, H&E, human
The alveoli (A) are well developed, and many exhibit precipitated
secretory product. Each of the alveoli is joined to a duct, although
that relationship can be difficult to identify. In this figure, several
alveoli are seen merging with one another (asterisks). Such
profiles represent alveolar units opening into a duct. The
epithelium of the intralobular ducts (ID) is similar in appearance to
the alveolar epithelium. The alveoli as well as the intralobular
ducts consist of a single layer of cuboidal epithelial cells and the
myoepithelial cell (M) is seen at the base of the epithelium (Inset).