Development of Enamel Organ Flashcards
The development of the enamel organ leads to the formation of what?
Tooth enamel
Tooth enamel is formed by what?
The development of the enamel organ
What type of development is the enamel organ?
Ectodermal development
What are the three stages of development for the enamel organ?
Bud, cap, and bell
What is the first stage of enamel development?
The bud stage
What characterizes the bud stage of enamel development?
Thickening of the ten areas of the dental lamina in each arch
Describe the tooth bud in the bud stage
- Inferior surface of bud is made up of mesenchymal cells
- Mesenchymal cells reproduce in a downward fashion from the basal layer
What are mesenchymal cells?
Cells that will later differentiate into more specialized cells
What are cells that make up the bud called at the end of the bud stage?
Dental papilla cells
What is the second stage of enamel development?
Cap stage
What characterizes the cap stage of enamel development?
A concave area deep within the bud and the differentiation of cells within the dental lamina
The thickening of ten areas of the dental lamina in each arch characterize which stage of enamel organ development?
Bud stage
A concave area deep within the bud and the differentiation of cells within the dental lamina characterize which stage of enamel organ development?
Cap stage
The oral epithelium differentiates into which 3 groups of cells at the end of the cap stage?
- Outer Enamel Epithelium
- Inner Enamel Epithelium
- Stellate Reticulum
When does the oral epithelium differentiate into three new groups of cells?
End of the cap stage
What is the Outer Enamel Epithelium?
- OEE
- direct continuation of the basal layer of the oral epithelium
- OEE cells protect the enamel organ
What is the Inner Enamel Epithelium?
- Direct continuation with the OEE cells
- IEE cells form the enamel organ
What is the stellate reticulum?
- Cells contained within the IEE and OEE which originate from the superficial layer of the oral epithelium
- Protect and cushion IEE cells
- Allow nutrients to pass through its loosely packed cells
What cells protect the enamel organ?
OEE
What cells form the enamel organ?
IEE
What cells originate from the superficial layer of the oral epithelium?
Stellate reticulum
What cells are a continuation of the basal layer of the oral epithelium?
OEE
Where do inner enamel epithelial cells come from?
Continuation of OEE cells
What is the third stage of enamel organ development?
Bell
What characterizes the bell stage of enamel development?
- Concavity of cap deepens
- Presence of fourth layer of epithelium called the stratum intermedium
The concavity of the cap deepening and the presence of a new layer of epithelium characterizes which stage of enamel development?
Bell stage
What is the new layer of epithelium that emerges called?
Stratum intermedium
Where does the stratum intermedium form?
Between the IEE and the stellate reticulum
What is the job of the stratum intermedium?
Provide nourishment and protein for IEE cells
Which cells provide nourishment and protein to IEE cells
Stratum intermedium
What happens once the bell stage is formed?
IEE cells elongate and change internally to become preameloblasts
IEE cells eventually become…?
Preameloblasts
