429 
he peripheral mesh work of the 
tectum where they mingle with those of the outer ganglion layer. 
These large cells which lie in the tract of the optic nerve connect 
rocesses can be traced to the lemniscus tract and into the medulla. 
basally with the latter. 
The péripheral processes extend into t 
Pp 
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Fig. 9. Diagrammatic longitudinal section of fish-brain illustrating the course of 
the most important tracts and commissures. 
