modified blastula

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• Blastocyst — A stage in the early embryonic development of mammals in which there is a hollow sphere with an outer layer of cells and inside the hollow sphere, there is a cluster of cells called the inner cell mass. If development continues, the outer layer… …   Medical dictionary

• blastocyst — noun Date: circa 1881 the modified blastula of a placental mammal having an outer layer composed of the trophoblast …   New Collegiate Dictionary

• animal development — Introduction  the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by …   Universalium

• echinoderm — /i kuy neuh derrm , ek euh neuh /, n. any marine animal of the invertebrate phylum Echinodermata, having a radiating arrangement of parts and a body wall stiffened by calcareous pieces that may protrude as spines and including the starfishes, sea …   Universalium

• 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

• animal — animalic /an euh mal ik/, animalian /an euh may lee euhn, mayl yeuhn/, adj. /an euh meuhl/, n. 1. any member of the kingdom Animalia, comprising multicellular organisms that have a well defined shape and usually limited growth, can move… …   Universalium

• sponge — spongeless, adj. spongelike, adj. spongingly, adv. /spunj/, n., v., sponged, sponging. n. 1. any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or… …   Universalium

• morphology — morphologic /mawr feuh loj ik/, morphological, adj. morphologically, adv. morphologist, n. /mawr fol euh jee/, n. 1. the branch of biology dealing with the form and structure of organisms. 2. the form and structure of an organism considered as a… …   Universalium

• Zebrafish — This article is about the tropical freshwater fish. For the Australian coral reef fish that is also known as zebrafish, see red lionfish. For the academic journal, see Zebrafish (journal). Danio rerio Scientific classification Kingdom …   Wikipedia

• Cnidaria — Temporal range: 580–0 Ma …   Wikipedia

• Echinoderm — Temporal range: Cambrian–recent …   Wikipedia