1911] Nervous System of Corydalis 243 



but farther up they grow out laterally to become continuous 

 with the lateral and dorsal cells at various levels while they be- 

 come absent from the mid-ventral line, then become united 

 again on the cephalic region where all the cell groups are joined 

 together. In intervals where these groups are not in distinct 

 masses a few scattered cells are often found. 



(b) Connectives 



Ventral connectives. Fibers from these run straight into the 

 ganglion for a short distance until the central, tangled mass is 

 reached. Only a few of the fibers in the central part of the 

 ganglion can be seen to take a straight course through it. 

 Many others run straight or nearly so for a short distance and 

 then turn off sharply to one side. Fibers from the connectives 

 seem to end at all levels and in practically all parts of the 

 central fibrous mass and to be contributed to by cell masses 

 especially on the ventral side, but also clearly on the dorsal. 

 These fibers coming in from both sides of the ganglion at differ- 

 ent levels and as single fibers or groups add considerably to the 

 complexity of the ganglion as does the fact that many of the 

 fibers from the connectives which run through to the crura 

 cerebri and nerves do not always take a straight course or run 

 to the same parts of the nerve trunks. Sweeps of fibers for 

 instance, can be traced quite straight up on the ventral side of 

 the ganglion and then may be seen to turn over to the dorsal 

 side. 



Crura cerebri. These have fibers from the caudal connect- 

 ives but not nearly all from them can be traced into the crura, 

 for they are smaller and have their own special fibers which 

 come from almost every part of the ganglion. The cells in 

 various parts seem to furnish many of these, some of which 

 come from the same side, but single strands were followed 

 running in the direction of the crura which were from the 

 opposite side. Fibers may also be seen to sweep back into it, 

 probably from the mandibular trunk. 



(c) Nerve trunks. 



Mandibular. Many of the fibers of this end in the first 

 part of the fiber mass. A few apparently run into the crura. 

 Some fibers could be traced from near the median central part 

 of the ganglion in a line with the lower connectives. Some 

 came to it from cephalic median cells. 



