ADTHORS' ABSTRACT OF THIS PAPER ISSUED 

 BY THE BIBLIOGRAPHIC SERVICE, OCTOBER 4 



EXPERIMENTAL OBSERVATIONS ON THE HISTO- 

 GENESIS OF THE SYMPATHETIC TRUNKS 

 IN THE CHICK 



ALBERT KUNTZ AND O. V. BATSON 

 Department of Anatomy, St. Louis University School of Medicine 



THREE FIGURES 



INTRODUCTION 



According to the older teaching the primordia of the sjTiipa- 

 thetic trunks arise from cells which become displaced from the 

 spinal ganglia. Some of the more recent investigators who have 

 studied the histogenesis of the sj^mpathetic nervous system have 

 presented evidence which indicates both that cells -which become 

 displaced from the spinal ganglia and cells which migrate from 

 the ventral portion of the neural tube take part in the develop- 

 ment of the sympathetic trunks; others still maintain that the 

 ganglia of the sympathetic trunks arise exclusively from cells 

 which advance peripherally from the spinal gangha. The liter- 

 ature bearing on this problem was reviewed recently by one of 

 the present writers (Kuntz '20) ^ and will not be considered further 

 in this paper. 



The senior author has for ten years advocated the theory that 

 cells of medullary origin play an important part in the develop- 

 ment of the sympathetic nervous system; nevertheless, he has 

 long recognized the limitations of direct observation on nomial 

 embryonic material as a method of obtaining conclusive evidence 

 on this point. The cells of ganghonic and medullary origin 

 which become displaced from the cerebrospinal nervous system 



1 The development of the sympathetic nervous system in man. Jour. Comp. 

 Neur., vol. 32, pp. 173-229. 



335 



