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A&P I > Hair > Flashcards

Hair Flashcards

1
Q

What is a hair follicle?

A

a sac-like structure which folds down form the epidermis into the dermal layer and from which hair grows

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1
Q

What is a peripheral connective tissue sheath?

A

The outermost wall of a hair follicle, derived from the dermis

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1
Q
A

glassy membrane

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1
Q
A

external root sheath

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3
Q

What is the root?

A

the portion of hair in which keratinization is still ongoing

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3
Q
A

cuticle

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4
Q
A

melanocytes

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5
Q

What is the medulla?

A

the central core of the hair consisting of large cells and air spaces, absent in fine hair

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5
Q

What is terminal hair?

A

coarse, long hair ( coarse in comparision to vellus hair)

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6
Q
A

hair papilla

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7
Q
A

cortex

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9
Q

What is the cuticle?

A

the outermost layer of a hair which is composed of a single layer of flattened shingle like cells

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10
Q

What is the epithelial root sheath?

A

the innermost portion of the follicle wall, mainly an invagination of the epidermis, has an internal and external layer

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11
Q

Which pigment is responsible for red hair?

A

trichosiderin

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12
Q

What is a glassy membrane?

A

a thickened basal lamina which constitutes the second outermost layer of the follicle wall

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13
Q

What is vellus hair?

A

pale, fine hair

14
Q
A

follicle wall

15
Q
A

external root sheath

16
Q
A

peripheral connective tissue sheath

17
Q

What is a hair papilla?

A

a small nipple-like projection of dermal tissue that protrudes into the hair bulb

18
Q

What is a hair shaft?

A

the portion of hair in which keratinization if complete

19
Q

Where is hair pigment made?

A

the base of the hair follicle

20
Q
A

hair matrix

21
Q

What is the cortex?

A

the bulky layer of flattened cells that that surrounds the medulla

22
Q
A

medulla

24
Q

What is hair?

A

flexible strands consisting largely of dead, keratinized cells

24
Q

What is the hair matrix?

A

the actively dividing area of the hair bulb that produces hair

26
Q
A

glassy membrane

27
Q

What are the three concentric layers that make up a hair?

A

the medulla,the cortex, and the cuticle

29
Q
A

cuticle

30
Q
A

cortex

31
Q
A

internal root sheath

32
Q

What is the arrector pili?

A

a bundle of smooth muscle fibers associated with each hair follicle and which pulls the hair shaft upright during contraction

33
Q
A

internal root sheath

34
Q
A

peripheral connective tissue sheath

36
Q

What is a hair follicle receptor?

A

sensory nerve endings that wrap around the hair bulb

37
Q
A

medulla

A&P I (7 decks)

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