primitive node
McGraw-Hill Science & Technology Dictionary:
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Hensen's node
(′hen·səns ′nōd)
(embryology) Thickening formed by a group of cells at the anterior end of the primitive streak in vertebrate gastrulas.
American Heritage Stedman's Medical Dictionary:
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primitive node
n.
A knotlike thickening at the anterior end of the primitive streak of the blastoderm at the point of origin of the embryonic head. Also called Hensen's node, primitive knot.
Saunders Veterinary Dictionary:
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Hensen's node
The primitive knot in the early embryo from which the notochord develops. It establishes the longitudinal axis and the polarity of the embryo. Called also primitive node, primitive knot.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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