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Histology > Test Four Skin > Flashcards

Test Four Skin Flashcards

1
Q

Melanocytes are derived from

A

Neural crest

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2
Q

Purpose of folding of dermis and epidermis

A

Increase surface area

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3
Q

What are the cells in stratum corneum

A

Dead cells with 15 to 20 layers

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4
Q

Cell type of stratum spinosum

A

Transitions from cuboidal to squamous

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5
Q

Projection of dermis is called

A

Papilla

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6
Q

The stratum lucidum contains

A

The transitional zone between living and dead skin

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7
Q

What are at the base of the merkel cells

A

Free nerve endings

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8
Q

Merkel cells attach to the

A

Nervous system

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9
Q

How does papillary layer in dermis anchors into basal lamina

A

Anchoring fibers (collagen)

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10
Q

Where do langerhahn cells form

A

Bone marrow

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11
Q

What is in the inside of merkel cells

A

Dense granules

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12
Q

Cells of stratum lucidum

A

Flattened cells with no organelles or nucleus

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13
Q

What is the malpighian layer

A

Spinosum and basale are pushed together and undergo mitosis

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14
Q

Evaginations of epidermis are called

A

Epidermal ridges

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15
Q

What is on the cells of stratum spinosum

A

Tonofibrils

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16
Q

What are the five layers of the epiderms

A

Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum and stratum corneum

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17
Q

Where are langerhahn cells

A

Stratum spinosum

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18
Q

What is the deepest layer of the epidermis

A

Stratum basale

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19
Q

What are tonofibrils

A

Hold cells together to resist abrasion and resist movement in lateral direction

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20
Q

What are the two layers that make up the dermis

A

Papillary layer and reticular layer

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21
Q

Merkel cells are what type of cells

A

Mechanoreceptors

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22
Q

What are the three parts of the skin

A

Epidermis, dermis and hypodermis

23
Q

What are in the granules of stratum granulosum

A

Contain lipid material for waterproofing

24
Q

What is in the cytoplasm of stratum lucidum

25
Q

What is in the cells of the stratum granulosum

A

Keratohyaline granules

26
Q

What can be the thickest layer in the epidermis

A

Stratum spinosum

27
Q

How does stratum corneum respond to stress on skin

A

Build up more keratin

28
Q

Epi of stratum basale

A

One layer of cuboidal shaped cells that rest on basal lamina

29
Q

Epidermis derived from

30
Q

Where are melanocytes bound to

A

Basal lamina through hemidesmosomes

31
Q

What are the three cells of the epidermis

A

Melanocytes, langerhahn cells and merkel cells

32
Q

Cells of stratum granulosum

A

3 to 5 layers of squamous cells

33
Q

What makes up the dermis papillary layer

A

Loose CT, fibroblast, mast cells and macrophages

34
Q

Function of melanin

A

Absorption of UV radiation and protect nucleus from UV

35
Q

The papillary layer in the dermis forms what layer

A

Dermal papilla

36
Q

What makes up the hypodermis

A

Subcutaneous tissue with adipose cells and loose CT

37
Q

Function of langerhahn cell

A

Macrophage of skin

38
Q

Dermis derived from

39
Q

Shape of melanocytes

A

Rounded cell bodies with long irregular extensions

40
Q

What is found in the reticular layer of dermis

A

Blood vessels and lymphatics, hair follicles, sweat glands, sebaceous glands

41
Q

Largest organ in the body

42
Q

Where are merkel cells found

A

Found in deeper layers of epidermis

43
Q

Function of skin

A

Protection from UV, water loss,

44
Q

Function of stratum granulosum

A

Waterproofing or water loss

45
Q

Function of stratum basale

A

Mitosis, where all other layers develop from

46
Q

Melanocytes contain

A

Melanin which is brownish black pigment

47
Q

Function of hypodermis

A

Protection and insulation

48
Q

Shape of langerhahn cell

A

Star shaped cells

49
Q

Reticular layer in dermis is made up of

A

Dense irregular CT with collagen fibers and elastic fibers

50
Q

Where are melanocytes found

A

Between cells in the stratum basale and spinosum

51
Q

Function of stratum corneum

A

Protective layer from physical stress of body

52
Q

What is in the cells of the stratum corneum

A

Keratin with no nucleus

53
Q

What is in the stratum basale cells

A

Keratin granules held together by desmosomes and hemidesmosomes

Histology (14 decks)

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