Portion of the hair visible above the skin surface.

Portion of the hair beneath the skin surface.

Tubelike sac in the dermis out of which the hair shaft develops.

Cell in the epidermis that produces melanin

Lack of hair in spots; baldness.

Thin layer of keratin that covers the distal portion of fingers and toes

Half-moon-shaped area at the base of the nail plate.

Thin band of epidermis that surrounds the edge of nails, except at the top.

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Integumentary system

Hair and nails

Term	Definition
Hair shaft	Portion of the hair visible above the skin surface.
Hair root	Portion of the hair beneath the skin surface.
Hair follicle	Tubelike sac in the dermis out of which the hair shaft develops.
Melanocyte	Cell in the epidermis that produces melanin
Alopecia	Lack of hair in spots; baldness.
Epilation/ Depilation	Removal of hair by the roots.

Nails	Thin layer of keratin that covers the distal portion of fingers and toes
Lunula	Half-moon-shaped area at the base of the nail plate.
Cuticle	Thin band of epidermis that surrounds the edge of nails, except at the top.