So the breast is down to the left of the pectoralis muscle and it's this entire structure here. Now at the center of the breast we have the mammary gland and the mammary gland consists of the lobules of granular tissue also known as alveoli, as well as the milk ducts. Now, the lobes of granular tissue are these grapelike structures that consist of specialized gland cells, specialized secretory cells that produce and release milk. And when the milk is produced and released, it is released into these milk ducts and these ducts act as passageways. They allow the movement of the milk from the lobules of granular tissue and to the nipple where the nipple has very tiny holes that allows the passageway of the milk out of that breast. Now, the nipple also contains nerve endings as we'll see in just a moment.