THE DEVELOPMENT OF THE SYMPATHETIC 

 NERVOUS SYSTEM IN MAMMALS 



ALBERT KUNTZ 

 From the Laboratories of A nimal Biology of the State University of Towa 



WITH EIGHTEEN FIGURES 



CONTENTS 



I. Introduction 213 



II. Historical, Survey 214 



III. Methods of Investigation 218 



IV. Observations 219 



1 Sympathetic trunks 219 



a. Early development 219 



h. Cell migration 222 



c. Later development 229 



d. Nature of migrating cells 230 



2 . Prevertebral plexuses 233 



a. Develo ment 233 



6. Histogenetic relationships 234 



3. Vagal sympathetic plexuses 235 



a. Introductory 235 



b. Myenteric and submucous plexuses 236 



c. Pulmonary plexuses 239 



c/. Cardiac plexus 239 



e. Cell migration along the vagi 241 



V . Discussion of Results, and Conclusions 246 



(i. Migration of medullary cells 246 



h. The neurilemma 248 



c. Sympathetic excitatory and sympathetic sensory neurones 249 



il. A wider application of Schaper's conception 351 



e. Relation of the sympathetic to the central nervous system 251 



/'. Functional relations -^ 



V.'L Summary •• 253 



Bi bliography 256 



