Fig. 23 Vontral view of a niodol of the nie.sorlerm (wliite), spliinclin()])leuric 

 mesenchyme (sjreeii), vasofactive cells (yellow) and emlothelium (reill of an 

 embryo of two somites, fi, From this |ii>iiit caudad tiie mesoderm is continuous 

 across the median line. 



SO 



