Neural tube (canal) morphogenesis in notochordless amphibian (Xenopus laevis) embryos.

Neural tube (canal) morphogenesis was examined in embryos which exhibited notochord defects. Embryos which displayed a range of notochord defects were produced by either ultraviolet irradiation or cold shock treatments. Both treatments produced similar results. The neural canal appeared normal in morphology and internal ciliation in many of the embryos which contained severe notochord defects.