title: [Scanning electron microscopy study of membrane modification of blastomeres in the first stages of ovum development in trout (Salmo irideus Gibb.)].
abstract: Our study relates to the development of the membrane relief of the blastomeres of the trout egg from the stage before their division up to gastrulation. The surface of the blastoderm shows first a more or less dense system of crests which by the time of gastrulation are replaced by microvilli distributed over the whole surface of the enveloping layer. The deep blastomeres, loosely connected to each other by lamellipodes and filopodes produce only a few projections of their membranes and these are only semispherical bodies. Possible roles of the microvillosities in the respiratory exchange of the egg and in the motility of the enveloping layer, are considered.
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000502:physiology* / Q000648:ultrastructure; D002462:Cell Membrane / Q000648:ultrastructure; D005260:Female; D008855:Microscopy, Electron, Scanning; D008871:Microvilli / Q000648:ultrastructure; D010063:Ovum / Q000502:physiology* / Q000648:ultrastructure; D014337:Trout
vernacular_title: Etude par microscopie électronique à balayage des modifications de la membrane des blastomères au cours des premiers stades du développement de l'aeuf de Truite (Salmo irideus Gibb.).