ectoderm

ectoderm
—ectodermal, ectodermic, adj. —ectodermoidal /ek'toh deuhr moyd"l/, adj.
/ek"teuh derrm'/, n. Embryol.
the outer germ layer in the embryo of a metazoan. Also called ectoblast.
[1860-65; ECTO- + -DERM]

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      the outermost of the three germ layers, or masses of cells, which appears early in the development of an animal embryo. In vertebrates, ectoderm subsequently gives rise to hair, skin, nails or hooves, and the lens of the eye; the epithelia (surface, or lining, tissues) of sense organs, the nasal cavity, the sinuses, the mouth (including tooth enamel), and the anal canal; and nervous tissue, including the pituitary body and chromaffin tissue (clumps of endocrine cells). In adult cnidarians and ctenophores, the body-covering tissue, or epidermis, is occasionally called ectoderm. See also endoderm; mesoderm.

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  • ectoderm — ECTODÉRM, ectoderme, s.n. Învelişul extern al embrionului, din care provin tegumentele şi sistemul nervos. ♦ Tegumentul extern al celenteratelor. – Din fr. ectoderme. Trimis de LauraGellner, 10.06.2004. Sursa: DEX 98  ECTODÉRM s. (biol.)… …   Dicționar Român

  • Ectoderm — Ec to*derm, n. [Ecto + derm.] (Biol.) (a) The outer layer of the blastoderm; epiblast. (b) The external skin or outer layer of an animal or plant, this being formed in an animal from the epiblast. See Illust. of {Blastoderm} …   The Collaborative International Dictionary of English

  • ectoderm — ectoderm. См. эктодерма. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • ectoderm — 1861, from ECTO (Cf. ecto ) + DERM (Cf. derm). Coined by Prussian embryologist Robert Remak (1815 1865) …   Etymology dictionary

  • ectoderm — [ek′tō dʉrm΄, ek′tədʉrm΄] n. [ ECTO + DERM] 1. the outer layer of cells of an animal embryo, from which the nervous system, skin, hair, teeth, etc. are developed 2. the layer or layers of cells composing the skin, nervous system, etc. in all… …   English World dictionary

  • Ectoderm — Infobox Embryology Name = PAGENAME Latin = GraySubject = 6 GrayPage = 48 Caption = Organs derived from ectoderm. Caption2 = Section through embryonic disk of Vespertilio murinus. System = CarnegieStage = Days = 16 Precursor = GivesRiseTo =… …   Wikipedia

  • Ectoderm — One of the three primary germ cell layers (the other two being the mesoderm and endoderm) that make up the very early embryo. The ectoderm is the outermost of the three layers. It differentiates to give rise to many important tissues and… …   Medical dictionary

  • ectoderm — The outer of the three germ layers of the embryo (the other two being mesoderm and endoderm). Ectoderm gives rise to epidermis and neural tissue …   Dictionary of molecular biology

  • ectoderm —   n. outermost membrane and tissue.    ♦ ectodermal,    ♦ ectodermic, a.    ♦ ectodermosis,   n. disease of the ectoderm …   Dictionary of difficult words

  • ectoderm — noun Etymology: International Scientific Vocabulary Date: 1859 1. the outer cellular membrane of a diploblastic animal (as a jellyfish) 2. a. the outermost of the three primary germ layers of an embryo that is the source of …   New Collegiate Dictionary

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