154 



ANATOMY OF THE CENTEAL NERTO0S SYSTEM. 



in the lower vertebrates. In the figure of the cod-fish brain (Fig. 38) one 

 recognizes the corpus striatum in the large prominence at the frontal end. 

 If one wished to change this figure to represent a mammalian brain, he 

 would have to draw the hemispheres, wholly wanting in the teleosts, over 

 the basal structures of the forebrain. The figured fish-brain is to be com- 

 pared morphologically to a human brain, from which one has dissected off 

 the hemispheres, leaving the striatum tn situ. 



The investigations of V Gehuchten on teleosts and those of the author 



Fig. 102. — Frontal section of the forebrain of a teleost, bounded above by the 

 columnar epithelium, which incloses the ventricular cavity. The fish-brain is 

 drawn within the contour of a mammalian brain in order to show the relation 

 in size and position of the structures under consideration. 



on reptiles, established the fact that, from the great multipolar cells which 

 lie just in the center of the striatum, large bundles of fibers arise; also 

 that fibers which come to that organ from behind end there in ramifications. 

 The whole fiber-system has been previously designated the hasal fore- 

 irain-'bundU ; but since all of its fasciculi end in the ganglia of the thalamus 

 or metathalamus, a more appropriate name would be Tr. strio-tlialamici. 



