science of human body. anatomical training poster. fingernail anatomy. structure of human nail. cross-section of the finger

anatomical anatomy architecture arm beauty biology body bone care closeup concept cross crosssection cuticle dermatologist dermatology dermis detailed distal education epidermis eponychium finger fingernail fold grow hand health human illustration lateral lunula macro matrix medical medicine nail phalanx plate poster proximal pterygium research scheme science section side structure toe training treatment unit vector view