Appendix A. 
Coeloznic spaces Brain developing nom 
Embryonic niesoderni Namal plates 
-ttitfiSf;''; {K.iW*l as iSi |j is*; 
t'sr? .j! ti.f 
Figure lOA-H; Schematic drawings of the human embryo during the third and fourth 
weeks. Left side. Dorsal views of the developing embryo illustrating early formation of 
the brain, intraembiyonic coelom, and somites. Right side. Schematic transverse 
sections illustrating formation of the neural crest, neural tube, intraembryonic coelom, 
and somites. [Reprinted from Moore, Essentials of Human Embryology, 1988, Fig, 3-3, 
page 20, with permission from Elsevier.) 
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