Development Of Tooth

Development Of Tooth

Give the microscopic structure of Developing tooth Collagen Fibres Golgi apparatus
Answer:

Developing tooth Collagen fibres Golgi apparatus Developing tooth:

• The epithelium in relation to the alveolar process thickens to form dental lamina
• The cells of dental lamina proliferate at various sites to form enamel organ
• This enamel organ grows into underlying mesenchyme & assumes cup shaped appearance
• The mesenchyme is of neural crest origin & is called dental papilla
• The dental papilla alongwith enamel organ is called tooth germ
• This stage is called ‘cap stage’
• The cells of enamel organ adjacent to dental papilla becomes columnar & are known as ameloblasts

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• The mesenchymal cells adjacent to ameloblasts differentiate into odontoblasts
• The two cell layers are separated by a basement membrane
• Rest of mesenchymal cells form pulp
• This is called ‘bell stage’
• Ameloblasts lay down enamel & odontoblasts lay down dentin
• The root of the tooth is formed by laying down of layers of dentin & narrowing the pulp space
• The root dentin is covered by mesenchymal cells that differentiate into cementoblasts
• These cementoblasts lay down cementum

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Developing tooth Collagen fibres Golgi apparatus Collagen fibres:

• Each collagen fibre is made up of fibrils of diameter 20200 nm
• Each fibrils shows cross striations
• Each fibrils contains numerous myofibrils
• Size of each collagen fibre is about 112 micrometer in diameter They are arranged in groups

Developing tooth Collagen fibres Golgi apparatus Types:

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Developing tooth Collagen fibres Golgi apparatus Golgi apparatus:

• It is small, irregular structure

Developing tooth Collagen fibres Golgi apparatus Location:

• Usually near the nucleus

Developing tooth Collagen fibres Golgi apparatus Structure:

• It is made up of membranes
• Membranes form the walls of a number of flattened sacs that are placed over one another
• Towards the margins there are small rounded vesicles

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Developing tooth Collagen fibres Golgi apparatus Regions:

• Functionally, Golgi apparatus is divided into 3 regions

1. Cis face/ Cis Golgi

• It is a region near to the nucleus

2. Trans face/ Trans Golgi

• It is a region near cell membrane

3. Intermediate part

• It is present between cis & trans face