Mammary gland (IMAGE)
Caption
The breast forms a tree-like ductal structure that grows from the nipple into a tissue rich in adipocytes (fat cells), blood vessels, and immune cells. During pregnancy, alveoli form at the tips of the ducts. They have an outer layer of myoepithelial cells (green) that contract to squeeze milk from the inner layer of alveolar cells (pink).
Credit
Image by Lindsay Hinck, UC Santa Cruz
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