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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
Q

What are the 4 layers of epithelium keratinised masticatory mucosa?

A
  • keratinised layer
  • granular layer
  • prickle cell layer
  • basal cell layer
26
Q

What are keratinised layer cells features?

A
  • flattened cells
  • no organelles
  • filled with keratin
  • dehydrated - not flexible
27
Q

What is present in granular layer cells?

A

keratohyalin granules

28
Q

What do keratohyalin granules in granular layer cells contribute to?

A

filaggrin forming the matrix for filaments in keratinised layer

29
Q

What are prickle cells in epithelium of keratinised masticatory mucosa?

A

filaments ordered into bundles - tonofibrils

30
Q

What are non-keratinocytes known as?

A

clear cells

31
Q

What clear cells are found in the basal layer?

A

merkel cells
melanocytes

32
Q

What are the 4 types of clear cells?

A
  • merkel cells
  • melanocytes
  • langerhan’s cells
  • inflammatory cells
33
Q

What clear cells are found in more superficial layers?

A

langerhan’s cells

34
Q

What clear cells migrate into epithelium?

A

inflammatory cells

35
Q

What are merkel cells?

A

touch receptors

36
Q

What are melanocytes dense in?

A

melanosomes

37
Q

What do langerhan’s cells do?

A

dendritic - process antigenic material

38
Q

What do clear cells lack that make them shrink?

A

desmosomes

39
Q

What are the 3 layers of specialised mucosa?

A
  1. epithelium
  2. lamina propria
  3. muscle
40
Q

What does the epithelium of specialised mucosa contain?

A

papillae

41
Q

What are the 4 typed of papillae?

A
  • filiform
  • fungiform
  • foliate
  • circumvallate
42
Q

Where are filiform papillae found?

A

anterior part of tongue

43
Q

What structure do filiform papillae have?

A

cone-shaped structure

44
Q

What gives filiform papillae there tough, abrasive surface?

A

keratinised epithelial cover

45
Q

What gives filiform papillae there flexibility?

A

non-keratinised epithelium in between

46
Q

Where are fungiform papillae found?

A

anterior part of tongue

47
Q

What innervated fungiform papillae?

A

CN VII - lingual nerve via chorda tympani

48
Q

What do fungiform papillae present as?

A

red spots

49
Q

Where are foliate papillae found?

A

lateral margin of the posterior aspect of tongue

50
Q

What innervates foliate papillae?

A

CN VII (anteriorly)
CN IX (posteriorly)

51
Q

Where are circumvallate papillae found?

A

anterior to sulcus terminalis

52
Q

What innervates circumvallate papillae?

A

CN IX

53
Q

What is the importance of saliva?

A
  • taste
  • solvent and transport
54
Q

What are the 4 types of cells in taste pores?

A

Type I dark cells
Type II light cells
Type III
Type IV

55
Q

What type of cells in taste pores produce the taste pore substance?

A

Type I dark cells

56
Q

What are Type II light cells?

A

immature type III cells

57
Q

What type of taste pore cells prove support?

A

Type I and II

58
Q

What type of taste pore cells are receptors?

A

Type II and III

59
Q

What type of taste pore cells are synoptically coupled to gustatory nerves?

A

Type III

60
Q

What are type IV taste pore cells?

A

precursors of type I-III cells

Oral Biology (4 decks)

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