199 



Neuroglia is founl in the severul parts of the forebr^iin 

 whera nervs-cell.s are grouped in numbers. While the specific 

 forms assumei by aeurogliar elements exhibit consiierable diver- 

 sity, all are referable to but one type. Proro an irregular cell- 

 boiy, numerous fine processes extend in all directions for a 

 short distance, branching profusely as they proceed. The ulti- 

 mate t^igs are of quit? minute size, and hence it is that the 

 «hole presents a characteristically mossy appearance. Fig. 43 

 illustrates the features of a representative specimen. 



6. Summary of the ^orebrain. 



A fairly well-defined epistriatum is present, receiving 

 olfactory and other terminations. Its neurones are of the Golgi 

 II type, sending their axones into the striatum, in the main. 

 The axones from marginal zones enter the pallium. 



Neurones vrith widely spreading dendrites are arranged in 

 open order in the striatum. Their axones enter the tractus 

 strio-thalamicus for termination in the thalamus. The stria- 

 tum appears to be an olf acto-motor centre. 



The nucleus postolf actorius is a densely crowded group of 

 neurones. Olfactory fibres terminate here, and the derivative 

 axones form the tractus olfacto-habenularis. 



A group of large neurones in the vicinity of the recessus 

 neuroporicus gives origin to the median portion of the tractus 

 strio-thalamicus. This paired tract accompanies the neuropore 



