Ko te whakaurutanga o te epidermis ko te koraticys o Bastinocys ka neke haere ki runga i te rereketanga o te pūtau, a ka mate ka mate hei hanga i te kokonga-kore-nuku-kore. I te nuinga o te wa e whakapono ana ko te pikinga o te reanga, ko te papapa o te paparanga, ka noho papatahi o te Epidermis raua ko Dermis o te Epidermis. Ka rite ki te arai o te tinana o te tangata, ko te Epidermis kei te hono tika ki te taiao o waho, a he tino ngawari te pa ki nga ahuatanga o waho. Epidermal aging most easily reflects the influence of age and external factors on human aging.
I roto i te Epidermis o te kiri koroheke, te rereketanga o te rahi, me te taapiri i nga waahanga o te papapa me te kohuru o te Epidermal, ka heke te matotoru o te Epidermis. Epidermal thickness decreases by approximately 6.4% per decade, and decreases even faster in women. Epidermal thickness decreases with age. This change is most pronounced in exposed areas, including the extensor surfaces of the face, neck, hands, and forearms. Ko te Kiratitycytes te whakarereke i te ahua rite te kiri o te kiri, ka momona, ka nui ake te mahi whakahoutanga o te Epidermal Cell. thin, causing the skin to lose elasticity and wrinkle.
Due to these morphological changes, the epidermis-dermis junction is not tight and vulnerable to external force damage. Ko te maha o te melanocytes ka heke haere i muri i te 30 tau, ka heke te kaha o te melanocytes i te tere o te 8% -20% ia tau. Although the skin is not easy to tan, melanocytes are prone to local proliferation to form pigmentation spots, especially in sun-exposed areas. Langerhans cells are also reduced, making the skin immune function decline and susceptible to infectious diseases.
