Most of the breast is made up of a collection of fat cells which explains the fluctuation in size during your life. There are also areas called lobes (1) lobules (2) and lactiferous ducts (3). A breast is made up of 15 to 20 sections called lobes that surround the nipple (4). Each of these lobes is made up of many lobules, small round bags that produce milk in breastfeeding women. The lobes are connected by lactiferous ducts to transport milk to the nipple, which is in the center of a dark area of the skin called the areola (5). The areola contains small glands that lubricate the nipple during breastfeeding.
Each breast also has a network of ligaments, connective tissue, nerves, lymphatic vessels, lymph nodes (6) and blood vessels. The lymphatic system, which is part of the immune system, is a network of lymphatic vessels and lymph nodes circulating throughout the body. Lymph nodes are small kidney-shaped structures located near the lymphatic vessels. They act as filters by removing abnormal cells from healthy tissue.
Each breast rests on a large muscle called the pectoral muscle (7), with the ribs and the rib cage (8) below. There aren’t any muscles dedicated to supporting the chest; therefore, the relaxation that occurs as you get older is natural.