Hensen knot
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knot — 1. An intertwining of the ends of two cords, tapes, or sutures, in such a way that they cannot easily become separated; or a similar twining or infolding of a cord in its continuity. 2. In anatomy or pathology, a node, ganglion, or circumscribed… … Medical dictionary
Hensen's node — (primitive knot) the rounded front end of the embryonic primitive streak. V. Hensen (1835 1924), German pathologist … Medical dictionary
Hensen's node — primitive knot the rounded front end of the embryonic primitive streak [Hensen (1835–1924), German pathologist] … 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
Hensen — Victor, German anatomist and physiologist, 1835–1924. See H. canal, H. cell, H. disk, H. duct, H. knot, H. line, H. node, H. stripe … Medical dictionary
primitive knot — Hensen s node … The new mediacal dictionary
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 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
Regional specification — In the field of developmental biology, regional specification is the process by which different areas are identified in the development of the early embryo. The process by which the cells become specified differs between organisms. Contents 1… … Wikipedia
