236 



ALBERT KUNTZ 





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» P 





\nes. 



73va. 



Fig. 12. Transverse section through the sympathetic trunks and the anlagen 

 of the cceliac plexus of an embryo 12 mm. in length, X 150. 



Our knowledge concerning the development of the sympathetic 

 plexuses related to the vagi is very limited. The older workers 

 generally gave little attention to the peripheral sympathetic 

 plexuses. Onodi ('86), though he traced the origin of the sym- 

 pathetic trunks and the prevertebral plexuses to the spinal gan- 

 glia, could not derive the peripheral sympathetic plexuses from the 

 same source, because he found no cellular connections between 

 the latter and the sympathetic trunks. He believed it necessary, 

 therefore, to cling to the doctrine of Remak ('47) with regard to 

 the peripheral sympathetic plexuses and derive them from the 

 mesoderm. His. Jr., ('91) traced the origin of the peripheral 

 sympathetic plexuses, including the sympathetic plexuses in the 

 walls of the digestive tube and the sympathetic components re- 

 lated to the vagi, to cell-swarms which migrate peripherally from 

 the anlagen of the sympathetic trunks. 



