Mammary Gland Structure
The nipple of the breast is surrounded by the areola (nipple-areola complex). The areola has many sebaceous glands, and the skin color varies from pink to dark brown. The basic units of the breast are the terminal duct lobular units (TDLUs), which produce the fatty breast milk. breast is also composed of connective tissues (collagen, elastin), white fat, and the suspensory Cooper's ligaments.