primitive streak
noun Date: 1854 an elongated band of cells that forms along the axis of a developing fertilized egg early in gastrulation and that is considered a forerunner of the neural tube and nervous system

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Primitive streak — Primitive Prim i*tive, a. [L. primitivus, fr. primus the first: cf. F. primitif. See {Prime}, a.] 1. Of or pertaining to the beginning or origin, or to early times; original; primordial; primeval; first; as, primitive innocence; the primitive… …   The Collaborative International Dictionary of English

  • primitive streak — primitive streak. См. первичная полоска [у эмбриона]. (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.

  • primitive streak — n an elongated band of cells that forms along the axis of an embryo early in gastrulation by the movement of lateral cells toward the axis and that develops a groove along its midline through which cells move to the interior of the embryo to form …   Medical dictionary

  • Primitive streak — Infobox Embryology Name = Primitive streak Latin = GraySubject = 6 GrayPage = 47 Caption = Surface view of embryo of a rabbit. arg. Embryonic disk. pr. Primitive streak. Caption2 = Width = 215 System = CarnegieStage = 6b Days = 15 Precursor =… …   Wikipedia

  • primitive streak — Thickened streak of cells in early mammalian and avian embryos marks location of embryonic axis. Hensen&’s node is at the end of the primitive streak until the cellular movements of gastrulation cause it to regress caudally …   Dictionary of molecular biology

  • primitive streak — see germ band …   Dictionary of invertebrate zoology

  • primitive streak — noun Biology the earliest trace of the embryo in a fertilized ovum …   English new terms dictionary

  • primitive streak — the region of the embryo that proliferates rapidly, producing mesoderm cells that spread outwards between the layers of ectoderm and endoderm …   The new mediacal dictionary

  • primitive streak — noun : an opaque band that appears in the blastoderm in the axial line of the future embryo but somewhat behind the place where the embryo proper begins to develop and that represents a highly modified blastopore through which the involution of… …   Useful english dictionary

  • Полоска Первичная (Primitive Streak) — быстро разрастающийся участок ткани эмбриона, клетки которой, прорастая по обе стороны между наружной и внутренней пластинками зародышевого щитка и вперед по бокам от хорды, образуют мезодерму (ред.). Источник: Медицинский словарь …   Медицинские термины

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