Breast Anatomy

  • Ducts
  • Lobules
  • Dilated section of duct to hold milk
  • Nipple
  • Fatty Tissue
  • Pectoralis (pec) muscle
  • Chest wall/rib cage


  • Normal duct cells
  • Basement membrane (duct wall)
  • Lumen (center of duct)

Lymphatic System

  • Lymphatics drain fluid that carries WBCs from the breast tissues into lymph nodes in the axilla and substernal region.
  • Lymph nodes filter bacteria and play a key role in fighting off infection.


  • Breast Gland
  • Each breast has 15 to 20 lobes arranged like the petals of daisy.
  • Inside each lobe are many smaller structures called lobules.
  • At the end of each lobule are tiny sacs that can produce milk.