primitive node

primitive node
a mass of cells at the cranial end of the primitive streak, related to the organization of an embryo. Called also primitive knot.

Medical dictionary. 2011.

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  • Primitive knot — Latin nodus primitivus Gray s subject #6 47 Days 17 The primitive knot (or primitive node) is the organizer for gastrulation in vertebrates …   Wikipedia

  • primitive pit — n a depression immediately behind the primitive knot in which the primitive groove ends * * * a depression in the primitive node of the primitive streak at the cranial end of the primitive groove; it may open abnormally into a neurenteric canal …   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

  • Node — In general, a node is a localised swelling (a knot ) or a point of intersection (a vertex). Node may refer to: In mathematics Node (autonomous system), behaviour for an ordinary differential equation near a critical point Node (graph theory), a… …   Wikipedia

  • Primitive pit — Infobox Embryology Name = PAGENAME Latin = GraySubject = GrayPage = Caption = Surface view of embryo of Hylobates concolor. The amnion has been opened to expose the embryonic disk. (Primitive pit not labeled, but region is visible.) Caption2 =… …   Wikipedia

  • primitive knot — n a knob of cells at the anterior end of the primitive streak that is the point of origin of the embryonic head process see TAIL BUD * * * see Hensen s node …   Medical dictionary

  • Node — Literally a knot, a node is a collection of tissue. For example a lymph node, is a collection of lymphoid tissue. A nodule is a small node, a little collection of tissue. * * * 1. A knob or nodosity; a circumscribed swelling; in anatomy, a… …   Medical dictionary

  • 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 knot — Hensen s node …   The new mediacal dictionary

  • Hensen's node — (= primitive knot) Thickening of the avian blastoderm at the cephalic end of the primitive streak. Presumptive notochord cells become concentrated in this region. May well be a source of retinoic acid that is acting as a morphogen in the… …   Dictionary of molecular biology

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