Pronunciation: (NIH-pul)

In anatomy, the small raised area in the center of the breast through which milk can flow to the outside.

Source: NCI Dictionary of Cancer Terms

Caption: Anatomy of the female breast. The nipple and areola are shown on the outside of the breast. The lymph nodes, lobes, lobules, ducts, and other parts of the inside of the breast are also shown.

Caption: Male breast anatomy: Anatomy of the male breast showing the nipple, areola, fatty tissue, and ducts. Nearby lymph nodes, ribs, and muscle are also shown.

2003-05-23 Date last modified: 2014-10-28