Dermis: deep to the epidermis, composed of connective tissue proper and contains primarily collagen fibers (elastic and reticular fibers), dendritic cells, blood vessels, sweat glands, sebaceous glands, hair follicles, nail roots, sensory nerve endings, and smooth muscle tissue associated with hair follicles (errector pili). Two major regions are superficial papillary layer, and a deeper reticular layer.
Subcutaneous Layer: deep to the integument and not part of it. Consists of both areolar connective tissue and adipose connective tissue; in some parts adipose C.T. is predominant thus its also called subcutanous fat. The C.T. fibers of the reticular layer of the dermis are interwoven with those of the subcutaneous layer to stabilize the position of the skin and bind it to the underlying structures. The subcutaneous layer pads and protects the body, acts as an energy reservoir, and provides thermal insulation. Note: normally this layer is thicker in women than in men, and its regional distribution differs between the sexes.