The term 'skin layers' refers to the three distinct layers of the skin: the dermis (6 letters), corium (5 letters), and dermis (6 letters). The dermis is the innermost layer of the skin, and it is composed of connective tissue, sweat glands, hair follicles, and blood vessels. The corium is the middle layer of the skin, and it is composed of collagen and elastin fibers. The dermis is the outermost layer of the skin, and it is composed of dead cells, sebaceous glands, and sweat glands. Together, these three layers form the protective barrier of the skin.