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Histology > Test Four Skin > Flashcards

Test Four Skin Flashcards

(53 cards)

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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

Study These Flashcards
A

Epidermis, dermis and hypodermis

23
Q

What are in the granules of stratum granulosum

Study These Flashcards
A

Contain lipid material for waterproofing

24
Q

What is in the cytoplasm of stratum lucidum

25
What is in the cells of the stratum granulosum
Keratohyaline granules
26
What can be the thickest layer in the epidermis
Stratum spinosum
27
How does stratum corneum respond to stress on skin
Build up more keratin
28
Epi of stratum basale
One layer of cuboidal shaped cells that rest on basal lamina
29
Epidermis derived from
Ectoderm
30
Where are melanocytes bound to
Basal lamina through hemidesmosomes
31
What are the three cells of the epidermis
Melanocytes, langerhahn cells and merkel cells
32
Cells of stratum granulosum
3 to 5 layers of squamous cells
33
What makes up the dermis papillary layer
Loose CT, fibroblast, mast cells and macrophages
34
Function of melanin
Absorption of UV radiation and protect nucleus from UV
35
The papillary layer in the dermis forms what layer
Dermal papilla
36
What makes up the hypodermis
Subcutaneous tissue with adipose cells and loose CT
37
Function of langerhahn cell
Macrophage of skin
38
Dermis derived from
Mesoderm
39
Shape of melanocytes
Rounded cell bodies with long irregular extensions
40
What is found in the reticular layer of dermis
Blood vessels and lymphatics, hair follicles, sweat glands, sebaceous glands
41
Largest organ in the body
Skin
42
Where are merkel cells found
Found in deeper layers of epidermis
43
Function of skin
Protection from UV, water loss,
44
Function of stratum granulosum
Waterproofing or water loss
45
Function of stratum basale
Mitosis, where all other layers develop from
46
Melanocytes contain
Melanin which is brownish black pigment
47
Function of hypodermis
Protection and insulation
48
Shape of langerhahn cell
Star shaped cells
49
Reticular layer in dermis is made up of
Dense irregular CT with collagen fibers and elastic fibers
50
Where are melanocytes found
Between cells in the stratum basale and spinosum
51
Function of stratum corneum
Protective layer from physical stress of body
52
What is in the cells of the stratum corneum
Keratin with no nucleus
53
What is in the stratum basale cells
Keratin granules held together by desmosomes and hemidesmosomes

Histology (14 decks)

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