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Knowing about your breast structure will help you understand your cancer type and treatment.¹

In women, the breasts are made up of

• Nipple and areola (darker skin around the nipple)鈥攐n the outside of your breast
• Lobules鈥攖he milk-producing glands
• Ducts鈥攃arry the milk from the lobules to the nipple
• Connective and fatty tissue鈥攑rovides the structure of your breast
• Muscle鈥攕upports your breast tissue
• Blood vessels鈥攁rteries carry oxygen and nutrients to the breast and veins remove waste from the cells of your breast
• Lymph vessels鈥攃arry lymph fluid, which contains infection-fighting white blood cells. The lymph vessels from your breast drain under the arm (axilla) and into your chest. Cancer cells can spread to other areas of your body through the lymphatic system.
• Lymph nodes鈥攖he glands found along the lymph vessels. This is where the lymph is filtered. Abnormal cells are caught in the lymph node.
• Sentinel lymph nodes鈥攖he first nodes receiving lymph drainage from the tumor