| Breast tissue is situated above the pectoralis major muscle, which is located on top of the chest wall and ribcage.
 
 Types of tissues of the breast include:
 
 •  Glandular tissue, which is involved in production and secretion of milk
 •  Stromal tissue, which functions as supporting tissue
 • Lymphatic and immune system tissues, which remove cellular fluids, waste products of cells, and microbes
 
 Glandular structures of the breast consist of:
 
 •  Lobules, the glands which produce milk
 •  Ducts, which are the tubes through which milk passes from the lobules to the nipple)
 
 Stromal tissue of the breast includes:
 
 • Fat tissue
 • Fibrous connective tissue
 • The external portion of the nipple
 
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