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Laura’s Histology > Skin And Mucosa > Flashcards

Skin And Mucosa Flashcards

1
Q

Functions of skin

A

Protection - pathogens and UV
Thermoregulation
Water regulation - waterproofing/ prevents moisture loss
Sensation - touch

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2
Q

Layers of the skin

A

Epidermis (rmb epic is like top most)
Dermis
Subcutaneous layer

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3
Q

Describe the structure of epidermis

A

Epidermis is keratinized stratified squamous epithelium
Has 5 layers

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4
Q

Stratum granulosum is the which layer?

A

3rd layer

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5
Q

What is the order of the epidermis layers?

A

Stratum basale
Stratum spinosum
Stratum granulosum
Stratum lucidum
Stratum corneum

BEFORE SIGNING, GET LEGAL COUNSEL

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6
Q

What cells are found in the stratum basale

A

Stem cells. Only cells in the basale layer can divide

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7
Q

Which layer is not present in thin skin

A

Stratum lucidum

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8
Q

What are the four cells present in epidermis

A

Keratinocytes
Melanocytes
Langerhan cells
Merkel cells

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9
Q

Where does epidermis get its nutrients from

A

Dermis. Since epidermis is an epithelial tissues that is avascular, it has to receive the nutrients from the dermis which is a connective tissue layer

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10
Q

What is the dermis made out of

A

Papillary layer and reticular layer

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11
Q

What cells are located in the stratum basale

A

Merkel cells, melanocytes , stem cells

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12
Q

What are the two structures that help the epidermis and dermis adhere better

A

Rete ridges and dermal papillae

Rete ridges epidermis extends down and dermal papillae dermis extend up

Think pap up

basal cells have a highly indented and folded basal cell membrane with numerous hemi-desmosomes.

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13
Q

Cell with the largest proportion in the epidermis

A

Keratinocytes (95%)

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14
Q

What is the function of Merkel cells

A

Tactile/ sensory receptors

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15
Q

What is the function of melanocytes

A

Produce melanin

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16
Q

What is the function of Langerhans cells

A

Dendritic

They constantly monitor the environment on the epidermal surface and in the spaces between epidermal cells with their dendritic cytoplasmic processes. When activated, they are potent stimulators of cell-mediated immunological responses.

Antigen presenting
Facilitates skin allergic reactions

17
Q

What layer is the prickle cell layer

A

Stratum spinosum

Thick spiny so prickly

18
Q

Where is the Langerhans cells found in the epidermis

A

Found in stratum spinosum ie prickle cell layer

19
Q

What does the papillary layer consist of

A

Loose connective tissue
Fine collagen and elastic fibres
Location of most of the capillaries and nerve endings

20
Q

What does the Reticular dermis consist of

A

Dense irregular connective tissue
Thick collagen and elastic fibres

21
Q

Collagen vs elastic fibres in the dermis layer

A

Collagen gives strength
Elastic fibres permit stretching and recoil

22
Q

Name the network of blood supply between the reticular layer of the dermis and the subcutaneous layer

A

Cutaneous plexus

23
Q

What is the primary tissue in the subcutaneous layer?

A

Adipose tissue ie subcutaneous fat

24
Q

Layers in the oral mucosa

A

Epithelium and lamina propria (mucosae)

Epithelium and lamia propria are separated by a basement membrane

25
Q

The tissue type of lamina propria

A

Loose connective tissue , Areolar tissue specific

26
Q

Function of oral mucosa

A

Protection
Sensation
Secretion (saliva)

27
Q

At which parts of the mouth is the stratified squamous epithelium keratinized

A

Basically parts involved in mastication
Hard palate
Tongue (UPPER surface)
Gingivae

28
Q

At which parts of the mouth is the stratified squamous epithelium non-keratinized

A

Soft palate
Buccal mucosa
Underside of tongue

29
Q

Where is thick and thin skin found

A

Majority thin skin. Thick skin only at places with extra abrasion like soles of feet, palms

Laura’s Histology (12 decks)

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