Grafting Hensen's Node

  • Claudio D. Stern
Part of the METHODS IN MOLECULAR BIOLOGY™ book series (MIMB, volume 461)

1. Introduction

Soon after Spemann and Mangold's (1) famous demonstration, in 1924, that the dorsal lip of the blastopore of the gastrulating amphibian embryo has the unique ability to induce a second axis when grafted into an ectopic site in a host embryo, Waddington (2, 3) showed that Hensen's node is its equivalent in amniotes. After transplanting this region into an ectopic site in interspecific combinations of rabbit, duck, and chick embryos, he found that a second axis developed, where the nervous system was derived from the host ectoderm (4). Hensen's node is situated at the anterior (cranial) tip of the primitive streak during gastrulation and, in chick embryos, appears as a bulbous thickening, some 100 mm in diameter, centered around a depression, the primitive pit. At this point, the three germ layers of the embryo are in very close apposition.

In the avian embryo, operations involving Hensen's node at the primitive streak stage (10–20 h incubation, Hamburger and Hamilton (HH...


Pasteur Pipet Primitive Streak Watch Glass Fine Forceps Vitelline Membrane 
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Copyright information

© Springer Science + Business Media, LLC 2008

Authors and Affiliations

  • Claudio D. Stern
    • 1
  1. 1.Department of Anatomy and Developmental BiologyUniversity CollegeLondonUK

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