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Histology SU2017 > Lecture 2- Odontogenesis > Flashcards

Lecture 2- Odontogenesis Flashcards

1
Q

odontogenesis begins in the … embryonic week

A

6th

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2
Q

odontogenesis is the formation of tooth tissue from … cells originating in … primary germ layer

A

stem

ectoderm

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3
Q

two basic tooth tissues that arise from the ectoderm primary germ layer that are involved in tooth development are… and…

A

epithelium and mesenchyme

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4
Q

the 4 epithelial stages are

A
  1. epithelial dental lamina
  2. epithelial bud
  3. epithelial cap
  4. epithelial bell
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5
Q

3 parts of a tooth germ

A
  1. enamel organ (bell): epithelium
  2. dental papilla: mesenchyme
  3. dental follicle: mesenchyme
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6
Q

The primary dental lamina appears in the …. embryonic week and consists of two epithelial invaginations called… and…

A

vestibular lamina

and primary dental lamina

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7
Q

the primary epithelial buds appear…. in utero

A

6-8 wks

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8
Q

the central incisor primary buds appear at… in utero

A

6 weeks

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9
Q

the second molar primary buds appear at… in utero

A

8 weeks

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10
Q

The permanant epithelial buds appear …. to…

A

4 months in utero to 5 years postnatal

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11
Q

the first molar permanent buds appear…

A

4 months in utero

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12
Q

the central incisor permanent buds appear….

A

5 months in utero

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13
Q

The second molar permanent buds appear….

A

10 months postnatally

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14
Q

The 3rd molar permanent buds appear

A

5 years postnatally

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15
Q

a total of … epithelial buds arise from the primary dental lamina of each arch

A

16

10 primary teeth and 6 permanent molars

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16
Q

Each succedaneous tooth (primary tooth) has its own … that arises from the lingual side of the primary dental lamina

A

secondary dental lamina

17
Q

in the epithelial cap stage there is a concentration of epithelial cells that is a ….. which determines if the tooth is going to be anterior or posterior

A

signaling center

18
Q

the … stage has 4 distinct layers

A

epithelial bell stage

19
Q

what are the 4 layers of the epithelial bell stage from inside out

A
  1. inner epithelial layer
  2. stratum intermedium epithelial layer
  3. stellate reticulum epithelial layer
  4. outer epithelial layer
20
Q

secondary dental lamina arises from… not…

A

primary dental lamina

not oral epithelium

21
Q

the enamel organ is avascular or vascular?

A

avascular

22
Q

the dental papilla is avascular or vascular

A

vascular

23
Q

the dental follicle is vascular or avascular

A

vascular

24
Q

after formation of enamel, the ameloblasts and other layers come together come together to form

A

reduced enamel epithelium

25
Q

the dental papilla becomes the …

A

pulp

26
Q

the dental papilla has undifferentiated cells (stem cells) that become

A

odontoblasts, fibroblasts, reserve cells

27
Q

the dental follicle becomes the

A

periodontal ligament

28
Q

the stem cells of the dental follicle become…

A

cementoblast, fibroblast, osteoblast and reserve cells

29
Q

ameloblasts come from which layer of the tooth germ

A

inner epithelial layer

30
Q

the enamel organ is attached to both mesenchymal parts of the tooth germ by a

A

basal lamina

31
Q

the outer and inner layers of the enamel organ come together, at cervical loop, forming a double epithelial layer called….

A

Hertwig’s epithelial root sheath

32
Q

Hertwigs epithelial root sheath has 2 main functions

A
  1. determine root dentin outline

2. determines number of root canals of tooth

33
Q

The pulp came from the dental papilla, what 2 formative cell types arose from its stem cells?

A

odontoblasts and fibroblasts

34
Q

The periodontal ligament came from the dental follicle and what 3 formative cell types arose from its stem cells?

A

cementoblasts
fibroblasts
osteoblasts

Histology SU2017 (14 decks)

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