- 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.
primitive node
Look at other dictionaries:
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
