Lab8_OralCavity Flashcards

1
Q

What is the difference between the clinical crown and the anatomical crown?

A

Clinical Crown = Enamel + top of Dentin

Anatomical Crown = Enamel + top of Dentin + Gingiva (cuticle)

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2
Q

What structures are found in the root of the erupted tooth?

A

From outside → inside:
- Mucogingival Junctions
- Alveolar Bone
- Peridontal Ligament
- Dentin
- Odontoblast
- Pulp

At the bottom of the root → Peridontal Ligament becomes Apical Foramen

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3
Q

What are the layers of the gingiva?
What layer is just oustide the gingiva?

A

Inside → Outside:
1. Lamina propria
2. Stratum Germinativum
3. Stratum spinosum

Just outside the gingiva → Parakeratin:
- Not composed of dead cells
- Appears eosinophilic

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4
Q

How is the gingiva classified as an epithelium?

A

Parakeratinized stratified squamous epithelium

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5
Q

What is the composition of dentin?
What is the composition of pulp?

A

Dentin = similar to bone:
70% hydroxyapatite + 30% organic material which contains collagen type I

Pulp:
- Contains collagent type I and III
- Fibroblast cells
- Blood vessels, lymphatic and nerves
- Lined by odontoblasts

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6
Q

What is the structure of odontoblasts?

A

Columnar cells with processes running in the dentin called dentin canaliculi

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7
Q

What is Sharpey’s Fibers?

A

It is the site of insertion of the peridontal ligament into dentin (at the border)

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8
Q

What is the composition of mature vs immature enamel?

A

Mature enamel:
- 99% inorganic and made of hydrocyapatite crystals

Immature enamel:
70% inorganic material + 30% amolegenin

*Inorganic material goes away in slice processing so not there

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9
Q

What are the layers of the Enamel organ?

A

Outside → Inside
1. Outer dental Epithelium (ODE) → continuous with stratum germinativum of the skin
2. Stellate Reticulum:
- Wide intercellular spaces are present
- Largest area of the enamel organ

  1. Stratum Intermedium
    - Resembles stratum spinosum of the skin
    - Polygonal shaped cells (less space between)
  2. IDE (Ameoblasts)
    - Made of ameloblasts
    - Continuous with the stratum germinativum of the oral epithelium
    - Cells are columnar + rest on BM
    - Cells have short processes that project onto the enamel
  3. Enamel
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10
Q

What are the layers of the Esophagus?

A

Mucosa:
- Epithelium → non-keratinized stratified squamous
- Lamina propria → loose irregular CT with esophageal cardiac glands (mucous in upper and lower third)
- Muscularis mucosa → thin layer of longitudinally oriented smooth muscle

Submucosa:
- Loose irregular CT
- Esophageal glands proper (mucous glands found throughout)

Tunica muscularis:
- Upper thrid = skeletal muscle (voluntary)
- Middle third = skeletal and smooth muscle
- Lower third = smooth muscle (oblique orientation)

Adventitia/Serosa
- Aventitia: dense irregular CT (until esophagus traverses the diaphragm)
- Serosa: tin layer of loose CT covered by a mesothelium (simple squamous epithelium)

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