Fate mapping the avian neural plate with quail/chick chimeras: origin of prospective median wedge cells

J Exp Zool. 1989 Mar;249(3):271-8. doi: 10.1002/jez.1402490305.


The origin of prospective M cells, which are median neuroepithelial cells that become wedge-shaped during bending of the neural plate and eventually form the midline floor of the neural tube, was determined by constructing quail/chick chimeras and using the quail nucleolar marker to identify quail donor cells in chick host blastoderms. Two possible sites of prospective M-cell origin in the epiblast were examined: a single, midline rudiment located just rostral to Hensen's node and paired rudiments flanking the cranial part of the primitive streak. Our results suggest that M cells arise exclusively from the midline, prenodal rudiment. From this rudiment, M cells extend caudally throughout the entire length of the neuroepithelium. This new information on the origin of prospective M cells will aid in the analysis of their role in neurulation.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Central Nervous System / embryology*
  • Chick Embryo / growth & development*
  • Chimera*
  • Neuroglia / physiology*
  • Quail / embryology*