ANALYSIS OF THE SYMPATHETIC TRUNK 445 
A little farther down in the trunk the fibers derived from the 
tenth and eleventh white rami formed a single well-defined 
bundle which because of the degeneration was easily distinguished 
from the normal part of the trunk. This degenerated bundle 
could be traced through the trunk beyond the origin of the first 
splanchnic nerve. None of the degenerated fibers seemed to go 
Fig. 4 From the eleventh thoracic internodal segment of the sympathetic 
trunk of cat VII, showing the partially degenerated fascicles derived from a) the 
eleventh and b) the tenth white ramus. Osmic acid. X 260. 
into the greater splanchnic nerve, which was normal in appear- 
ance and seemed to receive all or nearly all of the undegenerated 
oval well myelinated portion of the trunk. In this case all of 
the fibers of the greater splanchnic nerve came from the white 
rami above the tenth. In one instance it received a few fibers 
from the tenth white ramus (Cat XIV) in another (Cat XVI) all 
of its fibers came from above the ninth. 
