Blastoderm
Blastoderm Blas"to*derm, n. [Gr. blasto`s sprout + E. derm.] (Embryology) the early stage of an embryo after the first cleavages of the ovum; also, the layer of cells of which the early embryo is composed; specifically: (a) the early embryo developing from a blastodisc, after the blastocoel has formed. (b) in an insect embryo, the layer of cells that surrounds the internal mass of the yolk. [PJC]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • blastoderm — blastodérm s. n., pl. blastodérme Trimis de siveco, 10.08.2004. Sursa: Dicţionar ortografic  BLASTODÉRM s.n. Membrană vitelină care dă naştere corpului embrionului. [< fr. blastoderme, cf. gr. blastos – germen, derma – piele]. Trimis de… …   Dicționar Român

  • Blastodérm — (Keimhaut), s. Entwickelungsgeschichte …   Meyers Großes Konversations-Lexikon

  • Blastoderm — ⇒ Blastula …   Deutsch wörterbuch der biologie

  • blastoderm — [blas′tōdʉrm΄, blas′tədʉrm΄] n. [ BLASTO + DERM] the part of a fertilized ovum that gives rise to the germinal disk from which the embryo develops blastodermic adj …   English World dictionary

  • Blastoderm — A Blastoderm is the layer of cells formed at one pole of the yolky egg of birds. The yolk prevents the division from taking place through the egg, resulting in meroblastic cleavage during the many cleavage divisions. At the pole containing less… …   Wikipedia

  • blastoderm — In many eggs with a large amount of yolk, cell division (cleavage) is restricted to a superficial layer of the fertilized egg (meroblastic cleavage). This layer is termed the blastoderm. In birds it is a flat disc of cells at one pole of the egg… …   Dictionary of molecular biology

  • blastoderm — noun Etymology: German, from blast + derm Date: circa 1843 a blastodisc after completion of cleavage and formation of the blastocoel …   New Collegiate Dictionary

  • Blastoderm — 1 Morula, 2 Blastula Die Blastula (von griechisch Blastos: der Keim, die Knospe, der Spross) ist ein frühes Embryonalstadium Vielzelliger Tiere, das auf das Morula Stadium folgt und die Furchung abschließt. Im engeren Sinne wird als Blastula nur… …   Deutsch Wikipedia

  • blastoderm — early embryonic tissue composed of blastomeres arranged in a sheet like fashion; used to refer to embryonic tissue before embryonic axis formation …   Dictionary of ichthyology

  • blastoderm — n. [Gr. blastos, bud; derma, skin] The primary epithelium formed in early embryonic development of many invertebrates; germinal membrane …   Dictionary of invertebrate zoology

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