On the Development of Dentin in Fish

Publisher Website
Google Scholar
Abstract
In the bony fish examined the development of the dentin takes place inside and basally to a previously established organic foundation of mesodermal enamel. It forms first near the basal edge of the ectodermal downgrowth. In some spp. (especially Anguilla vulgaris) the epithelium penetrates so deeply into the mesoderm that nearly the whole length of the tooth is established before any appreciable amt. of dentin is formed. The collagenous fibers of the dentin can be classified into two groupings by their direction and coarseness. First, argyrophil fibers from the dental papilla are so arranged as to form a layer of coarse, longitudinally arranged fibers. In certain species (Merluccius merluccius), the whole outer dentinal layer is of this type. In Gobius niger. Labrus bergylta, and Ctenolabrus rupestris, a second zone of dentin with radially arranged, finer fibers is found between the longitudinally arranged, coarse fibers and the columnar epithelium of the tooth germ. This forms the outermost layer of the tooth from the mesodermal enamel to the basal edge of the tooth. The formation of collagenous fibers proceeds so rapidly that a sharp boundary is created between the peripheral papilla cells and the newly formed dentin.
Keywords

This publication has 2 references indexed in Scilit: