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Oral Biology > Oral Mucosa > Flashcards

Oral Mucosa Flashcards

1
Q

What 2 things make up oral mucosa?

A

superficial epithelium
underlying connective tissue

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2
Q

What are the 3 functions of oral mucosa?

A
  • protection
  • sensation
  • secretion
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3
Q

What are the 2 types of gingiva?

A

attached
free

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4
Q

Where is the mucogingival junction?

A

between attached gingiva and alveolar mucosa

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5
Q

What type of gingiva is closest to teeth?

A

free gingiva

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6
Q

For a buccal infiltration what type of mucosa is injected without pain?

A

lining mucosa

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7
Q

What are the 4 layers of non-keratinised lining mucosa?

A

epithelium
lamina propria
submucosa
bone/ muscle

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8
Q

What type of interface is between epithelium and lamina propria in non-keratinised lining mucosa?

A

undulating interface with few rete pegs

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9
Q

Where would you find non-keratinised lining mucosa?

A

in areas not subjected to high stress

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10
Q

Is non-keratinised lining mucosa flexible?

A

yes

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11
Q

What does non-keratinised lining mucosa contain?

A

glands - salivary tissue

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12
Q

What type of epithelium is in lining mucosa?

A

stratified

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13
Q

What are the 4 layers of stratified epithelium in lining mucosa?

A

superficial layer
intermediate layer
prickle cell layer
basal cell layer

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14
Q

What are features superficial layer cells?

A
  • flattened cells
  • nuclei persist
  • not dehydrated - flexible
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15
Q

What are MCGs?

A

membrane coating granules

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16
Q

What makes the intermediate layer cells a permeability barrier?

A

MCGs discharge contents between cells

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17
Q

What are present in prickle cells?

A

membrane coating granules

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18
Q

What layer of stratified epithelium is the least differentiated?

A

basal cells

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19
Q

What process is often visible in basal cells in stratified epithelium?

A

mitosis

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20
Q

What layer in stratified epithelium of lining mucosa is clinically important when using a GTN spray and why?

A

intermediate layer cells absorb

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21
Q

What are the 4 layers of keratinised masticatory mucosa?

A

papillary layer
reticular layer
periosteum
bone

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22
Q

What is the main feature of the epithelium of keratinised masticatory mucosa?

A

rete pegs

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23
Q

Is submucosa present in keratinised masticatory mucosa?

A

no

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24
Q

What are features of keratinised masticatory mucosa?

A

thick lamina propria
resistant to compression
immobile and tough

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25
What are the 4 layers of epithelium keratinised masticatory mucosa?
- keratinised layer - granular layer - prickle cell layer - basal cell layer
26
What are keratinised layer cells features?
- flattened cells - no organelles - filled with keratin - dehydrated - not flexible
27
What is present in granular layer cells?
keratohyalin granules
28
What do keratohyalin granules in granular layer cells contribute to?
filaggrin forming the matrix for filaments in keratinised layer
29
What are prickle cells in epithelium of keratinised masticatory mucosa?
filaments ordered into bundles - tonofibrils
30
What are non-keratinocytes known as?
clear cells
31
What clear cells are found in the basal layer?
merkel cells melanocytes
32
What are the 4 types of clear cells?
- merkel cells - melanocytes - langerhan's cells - inflammatory cells
33
What clear cells are found in more superficial layers?
langerhan's cells
34
What clear cells migrate into epithelium?
inflammatory cells
35
What are merkel cells?
touch receptors
36
What are melanocytes dense in?
melanosomes
37
What do langerhan's cells do?
dendritic - process antigenic material
38
What do clear cells lack that make them shrink?
desmosomes
39
What are the 3 layers of specialised mucosa?
1. epithelium 2. lamina propria 3. muscle
40
What does the epithelium of specialised mucosa contain?
papillae
41
What are the 4 typed of papillae?
- filiform - fungiform - foliate - circumvallate
42
Where are filiform papillae found?
anterior part of tongue
43
What structure do filiform papillae have?
cone-shaped structure
44
What gives filiform papillae there tough, abrasive surface?
keratinised epithelial cover
45
What gives filiform papillae there flexibility?
non-keratinised epithelium in between
46
Where are fungiform papillae found?
anterior part of tongue
47
What innervated fungiform papillae?
CN VII - lingual nerve via chorda tympani
48
What do fungiform papillae present as?
red spots
49
Where are foliate papillae found?
lateral margin of the posterior aspect of tongue
50
What innervates foliate papillae?
CN VII (anteriorly) CN IX (posteriorly)
51
Where are circumvallate papillae found?
anterior to sulcus terminalis
52
What innervates circumvallate papillae?
CN IX
53
What is the importance of saliva?
- taste - solvent and transport
54
What are the 4 types of cells in taste pores?
Type I dark cells Type II light cells Type III Type IV
55
What type of cells in taste pores produce the taste pore substance?
Type I dark cells
56
What are Type II light cells?
immature type III cells
57
What type of taste pore cells prove support?
Type I and II
58
What type of taste pore cells are receptors?
Type II and III
59
What type of taste pore cells are synoptically coupled to gustatory nerves?
Type III
60
What are type IV taste pore cells?
precursors of type I-III cells

Oral Biology (4 decks)

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