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 isolated stratum collagen color healthcare component nerve cut skincare sensory melanin banner hypodermis fiber organ sebaceous depigmentation people gland papilla