Herrick, Gustatory Paths in Fishes. 421 



The terminal arborizations of this tract in the inferior lobe of 

 Ameiurus shown in Fig. 37 probably belong to the gustatory 



component. 



The tractus lobo-hdbaris arises from the whole of the lateral 

 lobule of the inferior lobe and its fibers mingle with those of 

 the tertiary gustatory tract, the two tracts, however, being well 

 separated where they leave the lobe (Fig. 20, 23). The trac- 

 tus lobo-bulbaris is the main path for descending impulses from 

 the inferior lobe (gustatory and other reflexes) and was termed 

 in Mayser's descriptions ('82, p. 319) -'Nervenfaserbahn ^. " 



sec. gustatory nuc 



neunlc 



tertiary 

 gustatoru tr 



Fig. 2j. One of the chief tertiary neurones of the superior secondary gusta- 

 tory nucleus of a young carp. GoLGl method. X 187. 



For the relations of this neurone to the surrounding structures, cf. Fig. 22, 

 which is drawn from the section next caudad. The dendrites spread out in the 

 mesial part of the secondary gustatory nucleus. The neurite at once enters the 

 tertiary gustatory tract for the inferior lobe and either passes out of the plane of 

 the section or becomes medullated and so fails to impregnate. 



The fact that it is larger (as mentioned by Mayser) in cyprin- 

 oids and the peculiarities of its course in the oblongata make it 

 probable that it is the chief motor return path for the higher 

 gustatory reflexes. This of course is not its only function, for 

 it clearly serves as the chief path for all descending impulses 

 from the inferior lobe to the oblongata and cord, and therefore 

 carries olfactory and other reflex impulses in addition to gusta- 

 tory. 



