Overview of the Integumentary (Skin) System
Nails are accessory structures of the integumentary system. The nail root lies under the nail fold. It contains cells which enable it to keep growing. The lateral nail fold overlaps the nail root, and forms the cuticle where it meets the end of the nail body.
Keratinocytes are cells in the epidermis which serve as barriers against pathogens, heat, UV radiation and water loss. Keratiization is when the keratinocytes produce more and more keratin and die, with the outermost layer shed off and replaced by newer cells.
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