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Tooth - Anatomy & Physiology (view source)
Revision as of 00:22, 27 March 2011
, 00:22, 27 March 2011no edit summary
*'''Inner epithelium''' which becomes the enamel secreting [[Enamel Organ#Ameloblasts|ameloblast]] layer
*'''Inner epithelium''' which becomes the enamel secreting [[Enamel Organ#Ameloblasts|ameloblast]] layer
==Components==
The enamel organ has many different components. These consist of:
The enamel organ has many different components. These consist of:
===Crown===
===Crown===
==Main Cells==
==Main Cells==
[[Image:Ameloblast Histology.jpg|thumb|right|150px|Ameloblast Histology - Copywright RVC 2008]]
[[Image:Ameloblast Histology.jpg|thumb|right|150px|Ameloblast Histology - Copywright RVC 2008]]
[[Image:Odontoblast Histology.jpg|thumb|right|150px|Odontoblast Histology - Copywright RVC 2008]]
===Ameloblasts===
===Ameloblasts===
'''Ameloblasts''' are cells in the enamel organ which forms the tooth. They secrete '''[[Enamel Organ#Enamel|enamel]]'''.
'''Ameloblasts''' are cells in the enamel organ which forms the tooth. They secrete '''[[Enamel Organ#Enamel|enamel]]'''.
'''[[Enamel Organ#Enamel|Enamel]]''' is acellular so once the connection with the ameloblasts via the '''Thomes' fibres''' is lost (upon eruption), the [[Enamel Organ#Enamel|enamel]] matrix cannot be remodelled.
'''[[Enamel Organ#Enamel|Enamel]]''' is acellular so once the connection with the ameloblasts via the '''Thomes' fibres''' is lost (upon eruption), the [[Enamel Organ#Enamel|enamel]] matrix cannot be remodelled.
===Odontoblasts===
The '''odontoblasts''' are cells in the '''enamel organ''' which forms the tooth. They secrete '''[[Enamel Organ#Dentine|dentine]]'''.
'''Odontoblasts''' are derived from mesenchyme and are composed of a single layer of elongated columnar cells. They are at the '''dental-pulp border'''. They secrete '''[[Enamel Organ#Dentinedentine]]''' which is a mineralised matrix of collagen I, [[Enamel Organ#Dentinedentine]] and proteins.
The first layer of [[Enamel Organ#Dentinedentine]] is formed on the enamel organ. As production increases, the odontoblasts are displaced from the [[Enamel Organ#Enamel|enamel]]. It is a major part of the tooth structure and is produced continually by the odontoblasts. The rate of [[Enamel Organ#Dentinedentine]] synthesis is increased during repair as it is innervated (but still acellular).
*'''[[Cementoblasts - Anatomy & Physiology|Cementoblasts]]'''
*'''[[Cementoblasts - Anatomy & Physiology|Cementoblasts]]'''