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Eric's Histology > Oral Cavity > Flashcards

Oral Cavity Flashcards

1
Q

Oral Cavity

A

Enclosed by dental arches, opened and closed by soft palate and tongue. Posterior border is oropharyngeal isthmus

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2
Q

Vestibule

A

External to teeth, oral fissure opens into it, opened and closed by muscles of faceial expression and by movements of lower jaw

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3
Q

Gingiva

A
  1. Attached - firmly bound to bone around roots of teeth
  2. Free or marginal - lies unattached around cervical region (cuff)
  3. Interdental - part of gingiva between teeth
  4. Mucogingival line - delineates attached from alveolar towards floor of mouth
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4
Q

Vermillion zone

A

Lips, darker skin

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5
Q

Vermillion border

A

Transition zone outlining vermillion zone

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6
Q

Philtrum

A

Verticle groove on the midline of upper lip, extending downward from nasal septum

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7
Q

Lips

A

Skin external, oral mucosa internal

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8
Q

Sublingual and oral submandibular salivary glands

A

Inferior border of oral cavity

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9
Q

Muscular Diaphragm

A

Fills between left and right sides of mandible body. Composed of mylohyoid muscles

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10
Q

Palate

A

Hard palate: anterior 2/3

Soft palate: posterior 1/3

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11
Q

Keratinocytes

A

Keratin-creating cells

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12
Q

Oral Epithelium

A

Stratified squamous, both keratinized (ortho and para) and nonkeratinized, derived from ectoderm

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13
Q

Oral Lamina Propria

A

Underlying connective tissue, epithelial (rete) pegs descend into connective tissue papillae, contain small mixed serio/mucous glands

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14
Q

Where types of mucosa are located?

A

Masticatory: Gingiva, hard palate
Lining: Lips, cheeks, floor of mouth, soft palate, ventral tongue
Specialized: Dorsum of the tongue

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15
Q

How does epithelial maturation differs according to function?

A

Layer structure
Thickness
Epithelial ridge patterns

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16
Q

Orthokeratinized

A

No nuclei in keratin layer

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17
Q

Parakeratinized

A

Small nuclei are retained

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18
Q

Epithelial layers

A

Lamina propria > Stratum basale > Stratum spinosum (prickle cells) > Stratum granulosum > Stratum corneum

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19
Q

Stratum basale contents

A

Stem cells, hemidesmosomes

20
Q

Stratum spinosum contents

A

Desmosomes

21
Q

Stratum granulosum contents

A

Keratohyalin granules - keratin aggregation

Lamellar granules - lipid coating

22
Q

Sratum corneum contents

A

Anucleate then acellular layer of stacks of cross-linked keratin coated with lipid

23
Q

Hard Palate layer

A 
Epithelium: Masticatory (keratinized stratified squamous ortho/para
Epithelium/CT junction: convoluted, many elongated papillae (Rete pegs)
Lamina propria (CT): connected to bone
24
Q

Attached gingiva CT

A

Many rete pegs

25
Q

Free/marginal gingiva CT

A

Not attached to bone

26
Q

Mucogingival junction layer

A

Epithelial changes: Attached- ortho/para keratinized
Alveolar - non-keratinized
Other Changes: attached - dense LP, many collagen bundles, attached to bone
Alveolar - LP is loose with many elastic fibers

27
Q

Lining mucosa layers

A

Non keratinized, lacks stratum granulosum (no keratinhyaline granules)
Found in cheeks and underside of tongue, soft palate

28
Q

Lips: combination of epithelia

A

Outside: skin
Vermillion border: thin epithelium, lots of capillaries, no salivary glands
Intermedate zone: parakeratinized
Labial mucosa: thicker epithelium, less capillaries, has salivary glands

29
Q

Nonkeratinocytes

A

Langerhans cells - phagocyti, antigen presenting cells
Merkel cells - nerve cell, function as touch and pressure receptors
Melanocytes - pigment cells derived from neural crest cells

30
Q

Filiform Papillae

A

Cover majority of tongue, keratinized, spine shaped

31
Q

Fungiform Papillae

A

At tip of tongue, nonkeratinized

32
Q

Foliate papillae

A

Posterior sides of tongue, nonkeratinized, have taste buds

33
Q

Circumvallate papillae

A

Along junction of body and base of tonsilar area, contain taste buds, surrounded by crypts with von Ebner’s glands

34
Q

von Ebner’s glands

A

Serous glands in crypts around circumvallate papillae, secrete serous fluid to wash out crypts

35
Q

Taste buds

A

Only true sensory cells in oral mucosa, barrel shaped, apical ends terminate in taste pit within taste pores
Replaced continually

36
Q

Saliva functions

A 
Major secretion of oral cavity
Lubricates mouth - mucous secretion
Buffering - bicarbonate
Digestion - amylase
Protection - washes for bacteria
Maintain tooth integrity
Taste
Tissue repair: growth factors
37
Q

Haptocorrin

A

Produced in saliva, binds to vitamin B12 to protect it from stomach acid

38
Q

3 Major salivary glands

A

Sublingual, submandibular, parotid

39
Q

Salivary gland parts from innermost out

A

Intralobular: Secretory tubes, intercalated duct
Extralobular: Striated duct, excretory duct, main excretory duct

40
Q

Salivary secretory units (parenchyma)

A

Serous demilune, mucous tubule, intercalated ducts, striated ducts

41
Q

Myoepithelial cells

A

Squeeze product out of secretory cells

42
Q

Intercalated duct

A

Conduct saliva

43
Q

Straited duct

A

Striated appearance, eosinophilic cytoplasm, stains lightly pink, columnar cells

44
Q

Parotid glands

A

Secretes alpha amylase, serous, largest gland, short striated ducts, long intercalated ducts

45
Q

Mumps

A

Infection and swelling of parotid glands

46
Q

Age related changes

A

Epithelium: thinner, epithelial ridges flatten, decreased langerhans cells, decreased filiform papillae on tongue, smoother, drier appearance
Lamina propria: Decreased cellularity, increased collagen, vascular changes, increased sebaceous glands of cheeks and lips
Salivary glands: atrophy with fibrous replacement and adipose tissue

Eric's Histology (6 decks)

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