skin anatomy. human body skin with parts vein artery hair sweat gland epidermis dermis and

skin anatomy science pore medical layer dermatology illustration health structure epidermis dermis human healthy vector tissue hair medicine section follicle diagram fat cross subcutaneous body biology artery care cell vein integument treatment design elastin graphic depigmentation white 3d muscle people cut component collagen physiology adipose cutaway model physical melanin epidermal