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Histology Final > Digestive System - oral > Flashcards

Digestive System - oral Flashcards

1
Q

Layers of oral mucosa

A

Epithelium
Lamina Propria
Muscularis mucosae

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2
Q

Submucosa in oral region

A

—> in “soft” regions: cheeks, lips, soft palate, Floor of mouth

Loose CT with blood vessels, nerves, minor salivary Glands…

Submucosa is absent in hard palate, gums, tongue

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3
Q

Regions of lip

A
  1. External Surface: stratified squamous keratinized
  2. Transitional Zone: stratified squamous keratinized
  3. Inner Surface: stratifies squamous non-kratinized –> muco-cutaneous junction
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4
Q

Parts of tongue

A

Body: movable, from ectoderm
Root: has Lingual tonsils, from endoderm
Ventral Surface: no papillae, non-keratinized, lamina propria mucosae
Dorsal Surface: papillae

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5
Q

Types of papillae

A

Filiform
Foliate
Fungiform
Circumvallate

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6
Q

Filiform papillae

A
  • conical
  • stratified suqmaous keratinized
  • no taste buds!!!
  • lamina propria mucosae

Primary CT papillae: Broad penetrations of the CT in the epiheltium
Secondary CT papillae: small penetrations from Primary papillae

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7
Q

Foliate papillae

A
  • ridges on lateral Surface
  • stratified squamous non-keratinized
  • lamina propria mucosae
  • has taste buds
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8
Q

Fungiform papillae

A
  • among filiform papillae
  • stratified squamous non-keratinized
  • has taste buds
  • lamina propria mucosae
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9
Q

Circumvallate papillae

A
  • at border between Body and root
  • 7 to 14
  • encircled by a Deep cleft
  • minor salivary Glands open in cleft
  • stratified suqamous non-keratinized
  • lamina propria mucosae (loose CT)
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10
Q

Tooth parts

A
  • Crown: Projects into oral cavity
  • Root: embedded in jaw
  • Neck: Junction of Crown and root
  • Pulp cavity
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11
Q

Tissues of tooth

A
  • dentine: mineralized tissue, surrounds entire Pulp, has tubules
  • Enamel: highly mineralized, covers dentine of Crown
  • Dental Pulp: CT inside Pulp cavity
  • Periodontium: all tissue which surround and support the tooth: cementum, periodontal ligament, alveolar bone, gums
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12
Q

developmental Sources of tooth

A

Surface ectoderm –> enamel

Head Mesenchyme –> Dentin, dental Pulp, periodontium

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13
Q

Stages of tooth formation

A
  1. Bud (Formation of tooth germs)
  2. Cap (Differentiation of tooth germs)
  3. Bell (Formation of tooth tissue)

4th week: primitive mouth of Surface ectoderm
6-7th week: dental laminae form
In each dental lamina: 10 enamel Organs form

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14
Q

Bud stage

A
  • Enamel Organs of 10 deciduous teeth: external side of dental lamina –> 6-8th week
  • EO of 32 permanent teeth: internal side in 12th week
  • head Mesenchyme around EO: DENTAL FOLLICLE
  • Mesenchyme that proliferates and bends the bud: DENTAL PAPILLA
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15
Q

Cap stage

A
  • outer Surface cells: squamous or cuboidal, outer enamel Epithelium
  • inner Surface cells: inner enamel Epithelium
  • central bulk: stellate reticulum
  • below stellate reticulum: intermediate layer
  • cervical loop

look at drawing

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16
Q

Bell stage

A

Alemogenesis until tooth erupts
Dentinogenesis and cementogenesis at all viable time of tooth

look at drawing!!!!!

17
Q

Dentine

A

Mineralized Matrix with dentine tubules

  • produced by odontoblasts
  • odontoblast: columnar, apical processes
  • as dentine thickens, odontoblast move centrally, leaving the tubules behind
18
Q

Dentinogenesis

A
  1. Secretion
  2. Mineralization

unmineralized Matrix: predentin

Matrix consists of: Collagen fibers type I, Ground substance

Mineralization: hydroxyapatite Crystals develop, formdentine globules with interglobular spaces

19
Q

Main types of dentine

A
  1. Primary: until Eruption of tooth
  2. Secondary: after Eruption, less mineralized
  3. Tertiary: as reaction to external insult
20
Q

Amelogenesis

A
  1. Secretion
  2. Mineralization
    - Primary: 40% is mineralized, crysals lie down
    - secondary
  • ameloblast produce Matrix
  • NO FIBERS IN MATRIX!
  • each ameloblast lays down a column –> prism (rod)
21
Q

Prism (rod)

A
  • 5-12 Million in one tooth
  • perpendicular to tooth Surface
  • core of Crystals and sheath of organic matrix
22
Q

Formation of teeth roots

A
  • form during teeth Eruption
  • cervical loop forms HERTWIG’S ROOT SHEATH
  • in dental follicle: cementoblast and fibroblasts (for periodontal ligament)
23
Q

Cementum

A
  • avascular and aneural
  • cementocytes that occupy lacunae and processes
  • Matrix: Collagen fibers and Ground substance
24
Q

Cementogenesis

A
  1. Secretion

2. Mineralization

25
Q

Types of Cementum

A

Primary (acellular): during Eruption, near Cervix

Secondary (cellular): as tooth is alive

26
Q

Periodontal ligament

A
  • in periodontal space
  • dense CT: fibroblasts and ECM
  • Collagen Fibers spead out (Sharpey’s fibers) from alveolar bone to cementum or dentine
27
Q

Dental Pulp and its regions

A
  • Coronal Pulp: in Pulp chamber of Crown
  • Radicular Pulp: in root canals

Regions of Pulp:

  1. Peripheral odontogenic Region: bodies of odontoblasts
  2. Central Region: loose CT with blood vessels and nerves
28
Q

Teeth replacement

A

Diphyodonty

29
Q

Primary (deciduous) dentition

A
  • 20 teeth

- from 6 to 30 months

30
Q

Mixed dentition

A
  • 6 to 13 years
  • when permanent teeth continue their Formation –> push the toots of deciduous teeth
  • Osteoclasts are significant here!!!
31
Q

Secondary dentition

A

32 permanent teeth

Histology Final (18 decks)

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