The document summarizes the structure of the skin. It is composed of three main layers: the epidermis, dermis, and subcutaneous layer. The epidermis is made up of 5 sublayers and does not have its own blood supply. The dermis lies below and contains collagen, elastin, and structures called appendages. The subcutaneous layer mainly contains fat cells and provides protection and support. The document describes each layer and their components in more detail.