583 



Fig. 6. 



Plex. chor. 



Lobus lin. lat. 

 Cerebellar crest 



Lobus vagi 



N. lin. lat. (X) 



Tuberc. acust. 



Trig. med. bundle 



Trig, spinal. 



Sec. vagus bundle 



Arcuate trig. f. 



Arcuate ac. f. 



of the ventral horn whose neuntes pass more or less directly out into 

 these roots without entering the fasciculus longitudinalis posterior. 

 Mauthner's fibres are shown in Figs. 1 — 7, in the latter figure 

 approaching their decussation. They arise as described by Gorono- 

 wiTSCH. The ventro-lateral tracts contain also large bundles from 

 the tectum opticum, and from the inferior lobes which need not be 

 described here. 



2) Centers for the Vth.-VIIIth.-lateral line nerve group. In the 

 region of transition from the spinal cord to the medulla the dorsal 

 horn becomes enlarged. In well impregnated sections it appears as 

 an extraordinarily complicated mass of branching nerve fibres, some- 

 what resembling olfactory glomeruli. Continuing forward it grows still 

 larger and becomes constricted oft" from the central grey matter by 

 bundles of medullated fibres surrounding it. Farther forward it grows 

 smaller and finally gives place to a tract of medullated fibres which 

 continues forward to the root of the trigeminus nerve. This is the 



