gastrula stage

См. также в других словарях:

• gastrula — The embryo in the stage of development following the blastula; in lower forms with minimal yolk, it is a simple double layered structure consisting of ectoderm and endoderm enclosing the archenteron, which opens to the outside by way of the… …   Medical dictionary

• Gastrula — Gas tru*la, n.; pl. {Gastrul[ae]}[NL., dim. fr. Gr. ? the stomach.] (Biol.) An embryonic form having its origin in the invagination or pushing in of the wall of the planula or blastula (the blastosphere) on one side, thus giving rise to a double… …   The Collaborative International Dictionary of English

• gastrula — [gas′tro͞o lə] n. pl. gastrulae [gas′tro͞olē΄, gas′tro͞olī] or gastrulas [ModL, dim. < Gr gastēr, the stomach] an embryo in an early stage of development, consisting of a sac with two layers, the ectoderm and endoderm, enclosing a central… …   English World dictionary

• gastrula — gastrular, adj. /gas troo leuh/, n., pl. gastrulas, gastrulae / lee /. Embryol. a metazoan embryo in an early state of germ layer formation following the blastula stage, consisting of a cuplike body of two layers of cells, the ectoderm and… …   Universalium

• gastrula — generally in embryology, a postblastula stage in which an archenteron (primitive gut or gastrocoele) forms by invagination of cells through a blastopore, and in which germ layers appear and the embryonic axis is formed. In fishes, an archentron… …   Dictionary of ichthyology

• gastrula — Embryonic stage of an animal when gastrulation occurs; follows blastula stage …   Dictionary of molecular biology

• gastrula — n. an early stage in the development of many animal embryos. It consists of a double layered ball of cells formed by invagination and movement of cells in the preceding single layered stage (blastula) in the process of gastrulation. It contains a …   The new mediacal dictionary

• gastrula — n. [Gr. dim. gaster, stomach] Embryonic stage resembling a sac with an outer layer of epiblastic cells (ectoderm) and an inner layer of hypoblastic cells (endoderm and mesoderm); the enclosed cavity is the archenteron or gastrocoel; gastrular adj …   Dictionary of invertebrate zoology

• gastrula — noun A stage in the development of embryos of most animals consisting of a two layered sac of ectoderm and endoderm …   Wiktionary

• gastrula — n. stage in embryonic development (Biology) …   English contemporary dictionary

• gastrula — [ gastrʊlə] noun (plural gastrulae li:) Embryology an embryo at the stage following the blastula, when it is a hollow cup shaped structure having three layers of cells. Derivatives gastrulation noun Origin C19: mod. L., from Gk gastēr, gastr… …   English new terms dictionary