enamel organ


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organ

 [or´gan]
accessory digestive o's (accessory o's of digestive system) organs and structures not part of the alimentary canal that aid in digestion; they include the teeth, salivary glands, liver, gallbladder, and pancreas.
organ of Corti the organ lying against the basilar membrane in the cochlear duct, containing special sensory receptors for hearing, and consisting of neuroepithelial hair cells and several types of supporting cells.
effector organ a muscle or gland that contracts or secretes, respectively, in direct response to nerve impulses.
enamel organ a process of epithelium forming a cap over a dental papilla and developing into the enamel.
end organ end-organ.
Golgi tendon organ any of the mechanoreceptors arranged in series with muscle in the tendons of mammalian muscles, being the receptor for stimuli responsible for the lengthening reaction.
sense o's (sensory o's) organs that receive stimuli that give rise to sensations, i.e., organs that translate certain forms of energy into nerve impulses that are perceived as special sensations.
spiral organ organ of Corti.
target organ the organ affected by a particular hormone.
vestigial organ an undeveloped organ that, in the embryo or in some remote ancestor, was well developed and functional.
o's of Zuckerkandl para-aortic bodies.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

e·nam·el or·gan

a circumscribed mass of ectodermal cells budded off from the dental lamina; it becomes cup shaped and develops on its internal face the ameloblast layer of cells that produce the enamel cap of a developing tooth. It has three layers in the cap stage and four layers in the bell stage of tooth development.
Farlex Partner Medical Dictionary © Farlex 2012

e·nam·el or·gan

(ĕ-nam'ĕl ōr'găn)
A circumscribed mass of ectodermal cells budded off from the dental lamina; it develops the ameloblast layer of cells, which produces the enamel cap of a developing tooth.
Synonym(s): dental organ.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

e·nam·el or·gan

(ĕ-nam'ĕl ōr'găn)
Circumscribed mass of ectodermal cells budded off from dental lamina; becomes cup shaped and develops on its internal face the ameloblast layer of cells that produce enamel cap of developing tooth. It has three layers in the cap stage and four in bell stage of tooth development.
Synonym(s): dental organ.
Medical Dictionary for the Dental Professions © Farlex 2012
References in periodicals archive ?
Our present data showed, amelogenin in a 53.29 % in rough endoplasmic reticulum in enamel organ and dental papilla in later stages; which means the start of the amelogenin synthesis occurring.
Immunolocalization of CD44 and the ezrin-radixin-moesin (ERM) family in the stratum intermedium and papillary layer of the mouse enamel organ. J.
The ameloblastoma is a benign odontogenic tumor of epithelial origin that exhibits a locally aggressive behavior with a high level of recurrence, being believed to theoretically come from dental lamina remains, the enamel organ in development, epithelial cover of odontogenic cysts or from the cells of the basal layer of the oral mucosa (Gungum & Hos,goren, 2005; Adebiyi et al., 2006).
In the center of the islands, loosely organized cells were found, resembling the stellate reticulum of the enamel organ (Fig.
Dens invaginatus is a developmental malformation resulting from an invagination of enamel organ into the dental papilla, beginning at the crown and some- times extending into the root before calcification oc- curs.1-4 This condition most commonly occurs in perma- nent maxillary lateral incisors, followed by maxillary central incisors,premolars,canines and less frequently in the molars.5-9 Cases of bilateraland multiple occur- rence have also been reported.6,10 The presence of double dens invaginatus is extremely rare.2 Involvement of deciduous teeth have also been reported.11
It represents a dense fibrous layer formed from mesodermal tissue that surrounds the epithelial enamel organ. The dental follicle associated with im- pacted third has potential to undergo cystic degenera-tion and form a dentigerous cyst.
Sicher and Bhaskar suggested that disturbances during morpho-differentiation might affect the shape and size of tooth without impairing the function of ameloblasts or odontoblasts, whereas Hattab et al suggested that the anomaly might occur as a result of outfolding of enamel organ or hyper productivity of dental lamina.
It has cytological features similar to those of various components of the enamel organ, dental lamina, reduced enamel epithelium and/or their remnants.
This potency and ability of excessive fluoride to cause changes within the body, raises concerns about similar damage that may be occurring in the bones.16 The safety of the use of fluorides ultimately rests on the assumption that the developing enamel organ is most sensitive to the toxic effects of fluoride.