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Oral Microscopic > Development Of Tooth And Supportin Tissues > Flashcards

Development Of Tooth And Supportin Tissues Flashcards

1
Q

Continuous horseshoe-band of thickened epithelium in the location of upper and lower jaws

A

Primary epithelial band

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2
Q

Thickening of the oral epithelium adjacent to condensation of ectomesenchyme

A

Dental lamina

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3
Q

2 subdivisions of primary epithelial band

A

Dental lamina

Vestibular lamina

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4
Q

How many stages are there in tooth development?

A

3 stages

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5
Q

Characterized by rounded, localized growth of epithelium surrounded by proliferating mesenchymal cells, which are packed closely beneath and around the epithelial buds

A

Bud stage

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6
Q

Condensation of the ectomesenchyme immediately subjacent to the tooth bud

A

Cap stage

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7
Q

It will eventually form the enamel

A

Enamel organ

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8
Q

Ball of condensed ectomesenchymal cells (it will form the dentin and pulp)

A

Dental papilla

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9
Q

This give rise to cementum and the periodontal ligament

A

Dental follicle or dental sac

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10
Q

Extension from the dental lamina that id connected to enamel organ

A

Lateral lamina

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11
Q

It is an artifact produced during sectioning of tissue

A

Enamel niche

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12
Q

Densely packed accumulation of cells projecting from the inner enamel epithelium into dental papilla

A

Enamel knot

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13
Q

Term used to constitute the structure that has enamel organ, dental papilla and dental follicle

A

Dental organ or tooth germ

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14
Q

Cluster of non dividing epithelial cells visible im section of molar cap stage

A

Enamel knot

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15
Q

First noted by expression of p21 gene expression

A

Enamel knot precursor cells

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16
Q

Temporary structures that disappear before enamel formation begins

A

Enamel knot or enamel cord

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17
Q

Stage where the enamel organ resembles a bell with deepening of the epithelium over dental papilla

A

Bell stage

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18
Q

Initiation of tooth development begins at?

A

37 days

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19
Q

Determination of specific tooth types at their correct position of jaws

A

Patterning

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20
Q

Teeth are all the same type

A

Homodont

21
Q

Teeth have different shapes or forms

A

Heterodont

22
Q

Packed closely beneath and around the epithelial bud

A

Supporting ectomesenchymal cells

23
Q

Connection between the lateral lamina and developing tooth

A

Lateral lamina

24
Q

A mass of similar epithelial cells transforms itself into morphologically and functionally distinct components

A

Period of histodifferentiation

25
Q

Pulls water into the enamel organ

A

Glycosaminoglygan

26
Q

Central part of the enamel organ

A

Stellate reticulum

27
Q

The tooth crown assumes its final shape

A

Morphodifferentiation

28
Q

Cells that will be making the hard tissues (ameloblast & odontoblasts) of the crown acquire their distinctive phenotype

A

Histodifferentiation

29
Q

Cells at the periphery of enamel organ assume a low cuboidal shape

A

Outer enamel epithelium

30
Q

Cells bordering on the dental papilla assume shorter columnar shape

A

Inner enamel epithelium

31
Q

Where IEE and OEE meet at the rim of enamel organ

A

Zone of reflexion or cervical loop

32
Q

Cells between IEE and Stellate Reticulum

A

Stratum Intermedium

33
Q

Discrete cluster of epithelial cells that results from the fragmentation of the dental lamina

A

Epithelial pearls

34
Q

Pioneer nerve fibers approach the developing tooth

A

Bud-to-cap stage

35
Q

Target of the nerve fibers

A

Dental follicle

36
Q

Nerve fibers penetrate the dental papilla

A

Dentinogenesis

37
Q

Absent in the pioneer nerve fibers approaching the tooth germ

A

Autonomic nerve fibers

38
Q

Permanent teeth arise from the??

A

Dental lamina

39
Q

Embryonic development of entire primary dentition

A

6-8 weeks in utero

40
Q

Successional permanent teeth

A

Week 20 - 10 mos after birth

41
Q

Permanent molars

A

Week 20 - 5 years of age

42
Q

How many enlargement or knobs will appear?

A

20

43
Q

Inner enamel epithelium will later differentiate into?

A

Ameloblast

44
Q

The peripheral cells of the mesenchymal dental papilla differentiate into?

A

Odontoblast

45
Q

The basement membrane that separates the enamel organ and the dental papilla just prior to dentin formation is called?

A

Membrana preformativa

46
Q

It will give rise to the epithelium for the root formation

A

Cervical loop

47
Q

Pattern of enamel knot that extends between the inner and outer dental epithelium

A

Enamel cord

48
Q

Hard tissue starts at what stage?

A

Late stage of bell stage

Oral Microscopic (3 decks)

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