enveloping layer
the outermost layer of cells surrounding the embryo that become very flattened in the blastula and give rise to the periderm

Dictionary of ichthyology. 2009.

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  • layer — A sheet of one substance lying on another and distinguished from it by a difference in texture or color or by not being continuous with it. SEE ALSO: stratum, lamina. SYN: panniculus. ameloblastic l. the internal l. of the enamel organ. SYN: enam …   Medical dictionary

  • Plate layer — Plate Plate, n. [OF. plate a plate of metal, a cuirsas, F. plat a plate, a shallow vessel of silver, other metal, or earth, fr. plat flat, Gr. ?. See {Place}, n.] 1. A flat, or nearly flat, piece of metal, the thickness of which is small in… …   The Collaborative International Dictionary of English

  • blastocyst — /blas teuh sist/, n. Embryol. the blastula of the mammalian embryo, consisting of an inner cell mass, a cavity, and an outer layer, the trophoblast. [1885 90; BLASTO + CYST] * * * ▪ embryo phase       a distinctive stage of a mammalian embryo. It …   Universalium

  • integument — 1. The enveloping membrane of the body; includes, in addition to the epidermis and dermis, all of the derivatives of the epidermis, e.g., hairs, nails, sudoriferous and sebaceous glands, and mammary glands. 2. The rind, capsule, or covering of… …   Medical dictionary

  • Epibolie — Unter Epibolie wird eine Wachstumsbewegung des Ektoderms über den Dotter verstanden. Dies geschieht allerdings nur bei dotterreichen Eiern, beispielsweise bei den Eiern von Vögeln. Der Begriff kann auch die Wachstumsbewegungen einer äußeren… …   Deutsch Wikipedia

  • indusium — indusial, adj. /in dooh zee euhm, zhee euhm, dyooh /, n., pl. indusia / zee euh, zhee euh/. 1. Bot., Mycol. any of several structures having a netlike or skirtlike shape, as the membranous overgrowth covering the sori in ferns. 2. Anat., Zool. a …   Universalium

  • cystoblast — cys·to·blast (sisґto blast) [cysto + blast] the layer of cells that lines the amniotic cavity of the early embryo on the side of the enveloping layer …   Medical dictionary

  • envelope — [ ɛnvələʊp, ɒn ] noun 1》 a flat paper container with a sealable flap, used to enclose a letter or document. 2》 a covering or containing structure or layer. 3》 Electronics a curve joining the successive peaks of a modulated wave. 4》 Mathematics a… …   English new terms dictionary

  • indusium — in•du•si•um [[t]ɪnˈdu zi əm, ʒi əm, ˈdyu [/t]] n. pl. si•a [[t] zi ə, ʒi ə[/t]] 1) bot fng Bot., Mycol. any of several structures having a netlike or skirtlike shape, as the membranous overgrowth covering the sori in ferns 2) anat. zool. anat.,… …   From formal English to slang

  • integument — noun Etymology: Latin integumentum, from integere to cover, from in + tegere to cover more at thatch Date: circa 1611 something that covers or encloses; especially an enveloping layer (as a skin, membrane, or cuticle) of an organism or one of its …   New Collegiate Dictionary

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