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Oral Biology 1 > Mucosa > Flashcards

Mucosa Flashcards

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1
Q

What is mucosa?

A

moist lining made from a layer of epithelium over a layer of connective tissue called the lamina propria

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2
Q

What are the functions of oral mucosa?

A

protection, secretion, sensation, absorption,

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3
Q

What kind of epithelium is found in mucosa?

A

stratified squamous

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4
Q

What are the usual layers of mucosa?

A

epithelium, lamina propria, submucosa, bone

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5
Q

What are the types of oral mucosa?

A

gustatory
masticatory
lining

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6
Q

What is masticatory?

A

mucosa on the hard palate
thick lamina propria (mucoperiosteum)
no or thin submucosa
subjected to friction
para keratinised

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7
Q

What is gustatory?

A

mucosa on dorsum of tongue
keratinised
similar to masticatory
characterised by papillae, some bearing taste buds

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8
Q

What is lining?

A

mobile and stretchable mucosa (cheeks, lips, floor of mouth, soft palate, ventral tongue)
non keratinised
loose lamina propria and wide submucosa

rapid turnover

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9
Q

What are the epithelium layers?

A

stratum basal

stratum spinousum

stratum granulosum

stratum corneum

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10
Q

What is the difference between keratinised, para-keratinised and non-keratinised?

A

keratinised = dead cells, better protection
non-keratinised = living cells
para-keratinised = atypical keratinisation that has some nucleai

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11
Q

What are rete pegs?

A

epithelial extensions that project into the underlying connective tissue in both skin and mucous membranes.

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12
Q

What are tonofilaments?

A

keratin intermediate filaments that combine as bundles to make tonofibrils

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13
Q

What is the role of keratohaylins granules?

A

found in the stratum granulosum

role is to cross-link tonofilaments and provide a protective barrier

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14
Q

What is the mucogingival junction?

A

junction between the soft, fleshy mucus membrane of the oral cavity and the tough, collagen rich gingiva

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15
Q

What % do keratinocytes make up of epithelium?

A

90%

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16
Q

What other cells are present?

A

Langerhans = antigen presenting cells (dendritic cells)

Merkel = sensory cells associated with mechanoreceptor neurons

Melanocytes = pigment producing

17
Q

What are the keratin projections emerging from the tongue?

A

filiform papilla

18
Q

What are the raised structures that contain tastebuds and look like mushrooms?

A

fungiform papilla

19
Q

What are the prominences at the dorsal tongue that also provide taste?

A

vallate papilla

20
Q

What is the red lip around the lip called?

A

vermillion border

21
Q

What is the inner lining of the lip called?

A

labial mucosa

22
Q

What are the two glands of the oral mucosa?

A

sebaceous glands
salivary glands

23
Q

What occurs in geographical tongue?

A

no filiform papillae in irregular patches causing smoothness

24
Q

What are the glands in the lamina propria of the lining epithelium?

A

exocrine

25
Q

What is the purpose of these minor salivary glands in lining mucosa?

A

Lubricate the surface of the cheek with mucous saliva

26
Q

Recalling the histology microscopy class on muscle tissues, what type of muscle is present deep to the glands in lining mucosa?

A

skeletal

27
Q

What layer should mitosis occur and what is the consequence if it occurs in another layer?

A

basal layer
can be a sign of cancer if mitosis is occuring in the upper areas

28
Q

What are the epithelium layers of lining mucosa?

A

stratum basale, stratum spinosum, stratum intermedium, stratum superficiale

29
Q

What is the difference between parakeratinised and keratinised?

A

parakeratinised has some cells present, keratinised has none

30
Q

What are the main histological differences between serous and mucous gland cells?

A

serous - stain pink, cell nuclei in the centre
mucous - foamy cytoplasm, cell nuclei at outer edge

31
Q

What cranial nerves provide sensorial function to the mouth?

A

glossopharyngeal (IX) - provides taste sensation to posterior 1/3 of tongue
facial (VII) - provides taste sensation of anterior 2/3 of tongue
trigeminal (V) - mandibular division provides mucous membranes and floor of the oral cavity, anterior 2/3 of the tongue (only general sensation0
Lower molar, incisor and canine teeth and the associated gingiva

32
Q

What cranial nerves provide motor function to the mouth?

A

hypoglossal (XII) - motor function to extrinsic/intrinsic tongue muscles
facial (VII) - motor function to buccinator and orbicularis iris
trigeminal (V) - motor function to muscles of mastication

33
Q

What attaches the basement membrane to the stratum basale?

A

hemidesmosomes

34
Q

What do minor glands secrete?

A

all mucous apart from lingual which has serous and mucous ducts

35
Q

What papilla do not have taste buds?

A

filliform papilla

Oral Biology 1 (13 decks)

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