Normal breast structure includes: skin, mammary glands, and fatty tissue. 1. Skin: For adult women, it is usually between the second and sixth ribs on the chest, and the breasts are symmetrical on both sides. And with the growing sex hormones, the breasts take on a hemispherical shape with cylindrical nipples and the skin in the center is light red. 2. Mammary glands: Glands generally refer to sebaceous glands and sweat glands, while breast glands are very developed and differentiated sweat glands type of skin glands, which produces a special function is the secretion of lotion, this is a more special point. 3. Adipose Tissue: The adipose tissue of the breast presents an encircling state, forming the breast into a hemispherical whole, and this layer of ring-like adipose tissue is called the fat capsule. The thickness of this layer may vary greatly depending on the age of the individual and the reason for childbearing.