Histo - Tooth Devel 3

Front 1

Ameloblasts are derived from?

Back 1

oral epithelial cells of ectomesenchyme

Front 2

ameloblasts are lost as the tooth erupts into the oral cavity and therefore not?

Back 2

renewable

Front 3

enamel rods are made up of?

Back 3

crystals - oriented in a different direction than interrod crystals, alythough they are similar in structure.

Front 4

cylinder-like in shape, contain crystals that run along the long axis.

Back 4

Enamel Rods

Front 5

found at the boundary b/t rods and interrod regions.
these regions contain proteins that remain following enamel development.

Back 5

Rod Sheaths

Front 6

Inner Enamel Epithelium Cells are.
1.) Epith. Type
2.) Nucleus location
3.)terminal web y/n

Back 6

1.) cuboidal low columnar
2.) Contain central nucleus
3.) yes
-poorly developed golgi, mitochondria are present.

Front 7

Ameloblast cells
1.) Epith. Type
2.) Nucleus location
3.) Golgi type

Back 7

1.) Elongated Columnar
2.) Polarized nucleus near statum intermedium
3.) highy developed golgi
- second junctional complex forms at the distal end.
basement membrane fragments and disintegrates during mantel predentin formation
-cells begin to secrete enamel protein

Front 8

when do inner enamel epithelial cell become ameloblasts?

Back 8

At the time when preodontoblasts elongate and become odontoblasts.

Front 9

IEE cell elongates furthur-> ameloblast
-underlying basement membrane fragments/disintegrates.
-nucleus polarizes
-organelle production
-second junctional complex (terminal web) forms at the distal end.

Back 9

Presecretory Stage

Front 10

Secretes Enamel Protein
Secretes Dentin Protein

Back 10

Secretory Stage

Front 11

T/F - First enamel is structure-less enamel?

Back 11

True - no rod formation occurs

Front 12

Enamel matrix is laid down at the ? end of the ameloblast during secretory stage.

Back 12

Distal - initial layer of enamel is structure less
mineralization occurs almost immediately leaving an initial layer of enamel

Front 13

Rod Formation Occurs during?

Back 13

Secretory Stage - structured enamel

Front 14

with formation of? protein matrix is secreted at both proximal and distal sites.
-enamel formation at the proximal site begins before enamel formation at the distal site.

Back 14

Tomes Process - tomes proximal end: forms inter rod region (wall)
-Tomes distal end: forms rods (rod)