**Quiz 2 Integumentary Unit:Hair & Nails updated

hair root

The part of the hair located below the surface of the epidermis.

vernix caseosa

cheesy substance covering the skin of the fetus

Lanugo

fine, soft hair, especially that which covers the body and limbs of a human fetus or newborn.

Vellus

Thin, soft, unpigmented hair covering the body women's and children bodies

terminal hair

Long, coarse, pigmented hair found on the scalp, legs, arms, and bodies of males and females.

bulb

the base of a hair follicle and its surrounding dermal root sheath, containing the papilla of the hair and matrix

hair shaft

visible part of the hair

hair matrix

a germinal layer of cells responsible for the growth of existing hairs and the production of new hairs when old hairs are shed

Hair cuticle, cortex, medulla

The three main layers of the hair shaft from the outside to the middle/medulla:

hair receptors

sensory nerve fibers entwining follicles

Arrector muscle

makes hair stand on end (cold) within the follicle structure (causes goosebumps)

nail plate

hard part of the nail

free edge

part of the nail plate that extends over the tip of the finger or toe

nail root

fastens the nail to the finger or toe by fitting into a groove in the skin

nail folds

Folds of normal skin that surround the natural nail plate

2 lateral ones on the sides and a proximal one by the cuticle.

nail bed

Portion of the living skin that supports the nail plate as it grows toward the free edge.

Hyponychium

Skin between the free edge and fingertip of the natural nail

Nail matrix

responsible for nail growth

Lunule

an opaque white crescent at proximal end of nail

Eponychium

cuticle

Know where the hair parts are (honors will not get a word bank on unit test)

Know where the fingernail parts are (honors will not get a word bank on unit test)

What is the life cycle of hair?

Anagen-actively growing

Catagen-hair matrix dies-follicle shrivels

Telogen-resting phase

Hair falls out

Medulla of hair shaft

core of hair

cortex of hair shaft

several layers of flattened cells surrounding the medulla

Where the hair pigment is found.

Why does hair become grey?

Melanocytes are producing less melanin

Cuticle (Hair)

transparent single outer layer of keratinized cells that overlap each other- surrounds cortex

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