THE REGION OF THE SPINAL CORD 



»9i 



Fig. 156. — Diagrams to illustrate the Development of the Vertebrate 



Ccelom. (After van Wijhe.) 



JV., central nervous system; JVc, notochord ; Ao., aorta; Mg., midgut. A, My., 

 myoccele ; Mes., mesoccele ; Met., metaceele ; Hyp., hypomere (pronephric). B 

 and C, My., myotome; Mes., mesoncphros ; S.d., segmental duct (pronephric) ; 

 Met., body cavity. 



