And in front of the entire ribcage we have these muscles shown in pink, known as the pexiralis muscle. So we have the major and the minor pectoralis muscle and the pectoralis muscle is actually connected to the breast via connective tissue. Now, what about the breast itself? 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.