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Oral biology > Gingiva > Flashcards

Gingiva Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

Talk about oral mucosa

A

lines oral cavity

coated with serous & mucous secretions

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2
Q

Talk about masticatory oral mucosa

A

represent 25%

consists of : hard palate & gingiva

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3
Q

Talk abut lining oral mucosa

A 
represents 60%
filmily
1) inferior surface or ventral surface of tongue
2) labial mucosa
3) buccal mucosa
4) soft palate

loosely

1) vestibule
2) alveolar mucosa
3) floor of mouth

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4
Q

Talk about specialized oral mucosa

A

represents 15%

consists of dorsal surface of tongue

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5
Q

What are components of oral mucosa

A

oral epithelium
lamina propria (c.t)
C.T papilla + epithelial ridges or rates pegs

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6
Q

Talk about oral epithelium

A

keratinized & non-keratinized

cells are called keratinocyte’s

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7
Q

What do keratinocytes involve in

A

maturation of oral epithelium

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8
Q

Talk about macro anatomy of gingiva

A

Color : pale pink & pigmented in colored races
Extension : from gingival margins to alveolar mucosa
Site : covers tooth neck & part of alveolar bone
separated by mucogingival junction

Consists of : free-attached gingiva & interdental papilla

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9
Q

Talk about MGJ

A

MGJ appears only in healthy gingiva
presents at facial surface of upper & lower jaw
Presents at lingual surface of lower jaw
But not at palatal surface of upper jaw

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10
Q

Talk about free gingiva

A 
extend along  cervical level of tooth facialy & lingualy
Extend to bottom of gingival sulcus 
tapers as knife edge ( gingival margin)
Free movable part
1-1.5 mm

separated from attached gingiva by free gingival groove

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11
Q

Talk about gingival sulcus

A

A shallow groove
lined by non-keratinized epithelium

The more shallow of it , the more favourable condition of gingival margin

depth : 0-6 mm
average depth : 1.8mm

Lymphocytes & plasma cells present at C.T at the bottom of gingival sulcus

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12
Q

Talk about attached gingiva

A

Extend from free gingiva to MGJ
Immovable part
attached to cementum & periosteum
has stipplings ( orange peel)
elevations of stipplings : high C.T papilae
depressions of stipplings : heavier epthelial rate pegs

depressed between eminence of socket forming inter-dental groove

absence of stipplings lead to inflammation

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13
Q

Talk about inter-dental papila

A

fills the inter­proximal spaces between adjacent teeth.

Inter­dental papilla have a tent or wedge shape ,
base connecting the margin of the gingiva at the center of each tooth ,

the apex tapers to the contact area.

Deep to the inter­dental papilla, the transeptal fibers of PDL are present.

­The gingival tissue found in depression between the buccal and lingual peaks of inter dental papilla is called Col which is nonkeratinized.

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14
Q

What are parts of gingiva that are non-keranized

A

Gingival sulcus

Col of inter-dental papila

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15
Q

Talk about histology of gingiva

A

Stratified squamous keratinized epithelium
basement membrane
C.T papillae + epth.ridges= long-slender-numerous
C,T or lamina propria=irregular
no submucosa

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16
Q

what are components of mucosa

A

Stratified squamous keratinized epithelium
basement membrane
C.T papillae + epth.ridges
C,T or lamina propria

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17
Q

is there submucosa at gingiva

A

no

18
Q

what are cells that called stratum germativum

A

st. basal

st. spinosum ( para basal)

19
Q

Talk about stratum germativum

A

capablilty to divide by mitosis to give new cells to compensate those lost by desquamation at the surface

20
Q

what is turnover time of gingiva

A

41-57 days

21
Q

what is turnover time of cheek

A

25 days

22
Q

what do cancer therauptic drugs block

A

block mitotic division of host normal cells & rapid dividing cancer cells

23
Q

What is turnover time

A

It is the time when cell division occurs & each daughter cell recycles either as maturation component or in progenitor population

24
Q

Talk about basal cell layer

A

single layer of high cuboidal cells
cells connected together by desmosomes
cells connected with B.M by hemidesmosomes.
down growth of epithelium to CT. is called epithelial rete pegs

Epithelial ridges interdigitate with C. T. papillae.

The rete pegs of the gingiva are tall, numerous, slender and irregular.

­It is the least differentiated cells

presence of tonofilaments which are important for desmosomes

25
Q

Talk about desmosomes

A

Thickneing of 2 adj, cell membrane
2 attachment plaques
tonofilaments
extracellular structure

26
Q

Talk about st.spinosum

A 
small polyhedral shape cells 
wide intercellular spaces
 desmosomes  are prominent 
prickle appearance.
active protein forming cells

contain; well developed Golgi apparatus-RER-mitochondria.

27
Q

What are intercellular bridges

A

desmosomes

28
Q

Talk about Odland bodies

A

Membrane coating granules
in the superficial layer of the spinous
in the lower granular cell layers.
large , oval and have an internal lamellated structure. They originate from the Golgi system.

responsible for the thickening of the cell membrane which occurs during keratinization.

They may form an intercellular agglutinating material.

29
Q

Talk about st.granulosum

A

flat cells containing basophilic granules called keratohyalin granules.

Their nuclei are small (hypnosis).
The cells synthesize protein

as they approach stratum cornium the rate of protein formation decreases.

­The tonofilaments are increased and are associated with keratohyaline granules.

Odland’s bodies are increased and discharged into the intercellular spaces

30
Q

Which cells has small nucleus or hypnosis nucleus

A

st.granulosum

31
Q

Talk about st.corneium

A

keratinized squamae
larger and flatter than the granular cells.
They are filled with closely packed tonofilaments surrounded by the matrix protein (filaggrin)

32
Q

What is the name of kertainohaylin granules

A

filaggrin

33
Q

What are 3 types of gingival epithelium

A

non-keratinized :10%
para-kertanized:75%
ortho-kertanized:15%

34
Q

Talk about para-kertanized

A

st.corneium retain pyknotic nucleus & remnants of organelle

35
Q

Talk about ortho-kertanized

A

at st.corneium , nucleus & organelle disappear

36
Q

Talk about criteria of non-kertainocytes

A

cant be stained with H&E
Need special stain
dont enter in kertanization & epthelial maturation
Appear singly between kertainocytes
dendritic except merkel cells
no tonofilaments or desmosomes except at merkel

37
Q

What is special stain of merkel cells

A

immunostain

38
Q

What is the name of melanocytes if they are engulfed either by epthelial cell or C.T cell

A

Epthelial cells : melanophore

C.T cells : melanophage

39
Q

Talk about junction between epthelial & C.T

A

By light microscope
Neutral mucopolysaccharides
Fine argirophilic reticulin fibers. ­
Special anchoring fibers.

By electron microscope: ­Called basal lamina 
Clear zone (lamina lucida), found just below the epithelial cells.

•Dark zone (lamina densa), found below the lamina lucida and consists of granular and filamentous material.

The anchoring fibers from C.T. penetrate the lamina densa in the region of hemidesmosomes. ­

The anchoring fibers interdigitate with the collagen fibers of C

40
Q

Where are elastic fiber found

A

walls of b.v

41
Q

which is the type of collagen fibers at superfacial papilary & Deep reticular layer

A

superfacial : collagen fibers in loose network with fine agriophilic fibers

Deep : dense collagen fibers arranged in network

42
Q

Talk about lamina propria

A

consists of cells & intercellular substances

cosnsits of 2 layers

Oral biology (5 decks)

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