human anatomy

anatomical anatomy and arrector artery background basal biology blood bones care cell corneum cross dermis diagram drawing ectodermal epidermis erector fat fiber follicle gland granulosum guards hair human illustration integumentary internal layer layers ligaments made mammals medical multiple muscle muscles nerve organ organs pigment pili pore root science scientific sebaceous section sense sensory shaft skin stratum subcutaneous sweat system the tissue touch underlying vein vessel