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Flashcards > Ch 6 nail and hair anatomy > Flashcards

Ch 6 nail and hair anatomy Flashcards

1
Q

What is nail matrix?

A

Actively growing part of nail at proximal end of nail body

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2
Q

What is lunula?

A

Whiteish area on proximal end of nail body

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3
Q

What are nail folds?

A

Folds of skin overlapping nail

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4
Q

What is eponychium (cuticle)?

A

Narrow band of epidermis from nail wall to nail body

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5
Q

What is hyponychium?

A

The free nail edge

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6
Q

What is free edge?

A

No underlying capillaries (whiteish)

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7
Q

What is nail body?

A

Underlying capillaries (pinkish)

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8
Q

What is nail plate?

A

The nail edge, root, and body

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9
Q

What is nail bed?

A

Layer of living epidermis covered by nail body

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10
Q

What is nail root?

A

Part embedded in skin

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11
Q

What is lanugo hair?

A

Fine, unpigmented, downy hair

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11
Q

Where don’t we generally find hair?

A

Sole and palms

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12
Q

What is vellus hair?

A

Fine hair, upper and lower limbs

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13
Q

What is terminal hair?

A

Coarser, pigmented longer: scalp, eyebrows, eyelashes

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14
Q

6 functions of hair

A

Protection, facial expression, heat, retention, sensory reception, visual identification, chemical signal dispersal

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15
Q

What produces hair color?

A

Synthesis of melanin in matrix

16
Q

What causes gray hair?

A

Reduction in melanin

17
Q

What causes white hair?

A

Stoppage of melanin

18
Q

What are the three phases of hair growth?

A

Anagen, catagen, telogen

19
Q

What is anagen phase?

A

Active phase

20
Q

What is catagen phase?

A

Brief regression period

21
Q

What is telogen phase?

A

Resting phase

22
Q

What is hair matrix?

A

Structure at base, epithelial cells divide, and new cells produce

23
Q

What is medulla?

A

Flexible, soft keratin

24
Q

What is hair cuticle?

A

Single cell layer around cortex

25
Q

What is cortex?

A

Flattened cells closer to outer surface

26
Q

What is hair follicle?

A

Oblique tube surrounding hair root

27
Q

What is CT root sheath?

A

Hair follicle originating in dermis

28
Q

What is epithelial tissue root sheath?

A

Hair follicle originating from epidermis

29
Q

What is arrector pili?

A

Thin ribbons of smooth muscle and causes goosebumps

Flashcards (55 decks)

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