324 



G. E. COGHILL 



R L L Vll^a 



RVIIl 



Figs. 42 to 46 Coiled-reaction stage (No. 447, sections 2-1-6 to 10) X 500. 

 Five successive serial, transverse sections through the entrance of the glosso- 

 pharyngeal nerve into the brain. Figure 42 is the most rostral. In it can be 

 readily recognized the ascending fibers of the lateral line component of the ninth 

 and tenth nerves {L.L.IX,X,Asc.a and b), and ventrally of these the visceral 

 sensory component of the facial nerve as the fasciculus soUtarius (Fas. Sol.). 

 The lateral line components are entering the brain in the three successive figures, 

 while the visceral sensory (R.Vis.X) enters in figure 44. In the two following 

 figures this component appears with the facial fibers as the fasciculus solitarius, 

 and in figure 46 the descending divisions of the lateral line roots occur (L.L. 

 IX,X,Des.a,b). The descending trigeminal tract (Tr.Des.V) appears as scattered 

 fibers immediately beneath the external limiting membrance throughout this 

 region. Neurones of the second order (Neu. II) stretch across the whole mesial 

 face of this system of root fibers. 



