Reptilian tooth development
نویسندگان
چکیده
منابع مشابه
Evolution of external genitalia: insights from reptilian development.
External genitalia are found in each of the major clades of amniotes. The phallus is an intromittent organ that functions to deliver sperm into the female reproductive tract for internal fertilization. The cellular and molecular genetic mechanisms of external genital development have begun to be elucidated from studies of the mouse genital tubercle, an embryonic appendage adjacent to the cloaca...
متن کاملThe Formation and Properties of the Organic Matrix of Reptilian Tooth Enamel
A number of features of enamel formation in the lizard Agama atricollis are described. The behaviour and properties of the ameloblasts indicate that the process of enamel formation is similar to the corresponding process in mammals; the fibrous enamel matrix appears to be formed from outgrowths of the cytoplasm of these cells. Interprismatic material, as it is known in mammals, is not produced,...
متن کاملThe reptilian brain
Figure 1. Vertebrate phylogeny, gross brain morphology, and homologous regions in the forebrain. (A) Phylogenetic tree of vertebrates and timeline of major events in amniote evolution. Shaded area in the phylogenetic tree indicates ‘reptiles’ as defi ned in the text. Red lines (lower panel) indicate the origin of amniotes (320 million years ago), the origin of dinosaurs (230 million years ago) ...
متن کاملMolecular genetics of tooth development.
Organogenesis depends upon a well-ordered series of inductive events involving coordination of molecular pathways that regulate the generation and patterning of specific cell types. Key questions in organogenesis involve the identification of the molecular mechanisms by which proteins interact to organize distinct pattern formation and cell fate determination. Tooth development is an excellent ...
متن کاملRadiographic Evaluation of Dental Development in Patients With Tooth Agenesis
Introduction: Hypodontia is one of the most common developmental anomalies. This study aimed to evaluate the variations of radiographic dental development in a group of Iranian children with dental agenesis. Materials and Methods: This study evaluated 1230 Orthopantomographs (OPGs) for agenesis of permanent teeth obtained from the patients aged between 8 and 18 years. Then the difference betwe...
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ژورنال
عنوان ژورنال: genesis
سال: 2011
ISSN: 1526-954X
DOI: 10.1002/dvg.20721