Tooth Development Flashcards
What primary embryonic layer is tooth enamel derived from?
The ectoderm
What are all parts of the teeth (apart from enamel) and surrounding structure derived from?
The ectomesenchyme
What is the ectomesenchyme part of?
The neural crest
What are the 3 primary embryonic layers?
Ectoderm
Mesoderm
Endoderm
Where is the neural crest? What can it also be called?
Between the ectoderm and neural tube.
Also called the ectomesenchyme.
What is the 4th cell type that forms between the ectoderm and neural tube?
The neural crest / ectomesenchyme
What embryonic layer forms the primitive nervous system?
The ectoderm
What does neural crest tissue migrate to form?
The face and jaw structures
What are the 5 stages of tooth formation?
- Initiation
- Morphogenesis
- Cytodifferentiation
- Matrix secretion
- Root formation
At what stage does the bud phase occur?
What is the bud phase?
Morphogenesis
When the dental lamina thickens in one area to form the enamel organ
What is the cap phase?
During which stage does it occur?
When the enamel organ forms a cap over the papilla and changes shape from bud to cap.
Occurs during morphogenesis.
What forms the cervical region in a later stage of tooth development?
The cervical loop
Which cells form the dental papilla?
Ectomesenchymal cells
What surrounds the dental papilla?
The dental follicle
What 2 epithelium meet at the cervical loop?
External enamel and internal enamel epithelium
When does the bell phase occur?
During cytodifferentiation
What are the 4 cell layers during the bell phase?
Stratum intermedium
Stellate reticulum
Internal enamel epithelium
External enamel epithelium
What layer supports the tissue during enamel formation?
Stellate reticulum
What has to be formed for enamel matrix formation to begin?
Dentine matrix
What do dental papilla cells differentiate into?
Odontoblasts
Which cells lay down the dentine matrix?
Odontoblasts
What do the internal enamel epithelial cells differentiate into once dentine formation starts?
Ameloblasts
What happens to some ectomesenchymal cells?
They become dormant and will be later responsible for the formation of tertiary dentine
What is present in dentine matrix but not in enamel matrix?
Collagen
