19111 



Nervous System of Corydalis 



233 



to be in a general way similar to the conditions found more 

 caudally. The main tracts of the connectives and of the nerve 

 trunks enter the central portion of each center as in the abdom- 

 inal region, but their distribution within was harder to make 

 out. There were tracts entering the last thoracic ganglion 

 from below, leaving it again as in the abdominal centers. 



Fig. 4. 



Fig. 3. Third thoracic ganglion from below. Methylene blue. x.30. 



Fig. 4. Connective branch leading off between the 2d and 3d thoracic ganglia, 

 nerve fibers from above and below enter the nerve trunk from the connective. 

 Also large and small nerve fibers shown. Methylene blue. x45. 



Tracts from the first abdominal pass up the outside of the con- 

 nective and cross over into the middle line, but from the third 

 thoracic to the second, and from the connectives of the second 

 to the first no such tract was clearly recognized. Fibers enter- 

 ing laterally both from motor and sensory nerves all pass in 

 towards the central part of the ganglion. In other words there 

 was no indication of a tract passing from cephalic branches into 

 the edge of the ganglion to run without termination up the out- 

 side of the connective to the next center. But there was an 

 indication of fibers passing through or into one ganglion from 

 the one below it. 



In the cephalic part of the thoracic ganglia fibers coming 

 from above may some of them be traced as a fine tract ending 



