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Embryology > 510-05 Oral Cavity Epithelia > Flashcards

510-05 Oral Cavity Epithelia Flashcards

1
Q

What are the functions of the oral cavity?

A

1) nutrient ingestion and initial digestion
- eating, drinking, chewing, sucking, swallowing
- taste
- production of saliva

2) communication
- speech, singing
- facial expressions

3) immunological responses
- reactions of lymphoid tissues

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2
Q

What are the 3 basic types of mucosa?

A

masticatory, lining, and specialized

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3
Q

What kind of tissue is found in hypodermis?

A

adipose tissue

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4
Q

Which of the skin layers contains the largest blood vessels?

A

hypodermis

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5
Q

What are the 2 types of sweat glands?

A

apocrine and eccrine

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6
Q

The epidermis is a ____ _____ ____ epithelium

A

keratinized stratified squamous epithelium

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7
Q

What determines the thickness of the epithelium?

A

the number of layers of keratinocytes and the presence or absence of hair

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8
Q

(T/F) Thick skin has hair and is found everywhere in the body

A

False, thick skin has no hair and is only found on palms and soles. Thin skin has hair and covers the rest of the body

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9
Q

What are the most abundant cells of the epithelium in the epidermis?

A

keratinocytes

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10
Q

What are the pigment cells in the basal layer of the epithelium?

A

melanocytes

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11
Q

What are the bone marrow-derived cells in the epidermis that can migrate into the dermis to present antigens to T lymphocytes?

A

Langerhans/dendritic cells

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12
Q

Which epidermal cells act as a sensitive mechanoreceptor (important for sensitivity)?

A

Merkel’s/tactile cells

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13
Q

The stratum lucidum is a transition layer between the stratum ___ and the stratum ___. Where is it best seen?

A

granulosum, corneum. Palms and soles

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14
Q

What is the muscle that surrounds the lips? What bones does it attach to?

A

orbicularis oris. No bones, inserts into itself.

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15
Q

Does the vermillion border have hair or glands?

A

no

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16
Q

The nerve endings in the vermillion zone of the lip are surrounded by nerve corpuscles called ___ ___.

A

Meissner’s corpuscles

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17
Q

Is the epithelium of the vermillion zone keratinized?

A

yes

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18
Q

Does the vermillion zone have salivary glands? Sebaceous glands?

A

no salivary glands. Has a few sebaceous glands

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19
Q

Which part of the lip has thick, stratified nonkeratinized or parakeratinized squamous epithelium?

A

oral mucosa

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20
Q

In parakeratinized squamous epithelium, there are some dead surface cells, but most surface cells have ____ (dark and shrunken) nuclei.

A

pyknotic

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21
Q

What are the general layers of the digestive tract?

A

1) mucosa
2) submucosa
3) muscularis externa
4) adventitia or serosa

22
Q

Which layer of the digestive tract is loose connective tissue with vessels, nerves, and glands?

A

submucosa

23
Q

Describe the inner and outer layers of the muscularis externa

A

1) inner circular layer of smooth muscle

2) outer loingitudinal layer of smooth muscle

24
Q

Oral epithelium is an avascular layer of cells resting on a basal lamina of type ___ collagen

A

IV

25
Q

What kind of epithelial tissue makes up oral epithelium?

A

stratified squamous epithelium

26
Q

(T/F) Cells of the oral epithelium are mostly melanocytes

A

FALSE, they are mostly keratinocytes

27
Q

Lamina propria in the oral mucosa is equivalent to which layer of the skin?

A

dermis

28
Q

In lamina propria of the oral mucosa, connective tissue papillae interdigitate with ridges of epithelial cells called ____ ridges

A

rete

29
Q

Is the density of connective tissue fibers higher or lower where the oral mucosa is less mobile?

A

higher

30
Q

What kinds of cells are found in the lamina propria of the oral mucosa?

A

fibroblasts, nerve fibers, and inflammatory cells

31
Q

What kind of glands may be present in the upper lip and buccal mucosa in most adults?

A

sebaceous

32
Q

Describe the muscularis mucosae of the oral mucosa.

A

The oral mucosa has NO muscalaris mucosae

33
Q

The submucosa is the connective tissue below the ___ ____

A

lamina propria

34
Q

What are the three types of oral cavity mucosa?

A

Lining mucosa, masticatory mucosa, and specialized mucosa

35
Q

Which type of oral cavity mucosa is found in the alveolar mucosa, labial mucosa, buccal mucosa, floor of the mouth, inferior surface of the tongue and the soft palate?

A

lining mucosa

36
Q

Which type of oral cavity mucosa is found in the gingiva and hard palate?

A

masticatory mucosa

37
Q

Which type of oral cavity mucosa is found on the dorsal surface of the tongue?

A

specialized mucosa

38
Q

What kinds of structures does lining mucosa cover?

A

skeletal muscle, bone, and glands

39
Q

What type of epithelium is lining mucosa?

A

nonkeratinized stratified squamous epithelium

40
Q

Masticatory Mucosa is firmly fixed to underlying bone by dense ____ tissue

A

connective

41
Q

In masticatory mucosa, the keratinocytes are differentiated into what 4 layers of cells that are similar to thin skin? (name them in order from base layer to surface layer)

A
  • stratum basale
  • stratum spinosum
  • stratum granulosum
  • stratum corneum

mnemonic: Bill Sends Grandma Cash

42
Q

In the stratum basale layer of masticatory mucosa, what kind of junctions attach cells to lamina propria?

A

hemidesmosomes

43
Q

In the stratum spinosum layer of masticatory mucosa, what kind of junctions anchors cells to other cells?

A

desmosomes

44
Q

In the stratum granulosum layer of masticatory mucosa, cells are filled with what kind of granules?

A

keratin

45
Q

In the stratum corneum layer of masticatory mucosa, are the keratinized cells permeable or impermeable?

A

They are relatively impermeable

46
Q

What kind of epithelium tissue makes up masticatory mucosa?

A

keratinized stratified squamous epithelium and in some areas parakeratinized stratified squamous epithelium

47
Q

In masticatory mucosa, what structures interdigitate deeply with the underlying connective tissue? What does this accomplish?

A

rete ridges. Anchors the mucosa and protects it from shearing stress

48
Q

What causes epithelial cells to exhibit differentiation?

A

different levels of keratinization

49
Q

In parakeratinized epithelium, the nuclei are described as ____

A

pyknotic

50
Q

Clusters of yellowish sebaceous glands in the oral mucosa are called ____ ____

A

Fordyce’s granules

51
Q

What are Fordyce’s granules?

A

clusters of yellowish sebaceous glands in the oral mucosa

Embryology (5 decks)

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