129 

 ia^, posteriorly aloni* the ventral border of the forebriin for 

 ultimate termination in the nucleus habenulae of the inter- 

 brain; see Section VII. 



The internal strictjre of a postolfactory neurone is not 

 of a prono'incei motor type. The nucleus is al^vays so lar^e 

 that it touches the periphery of the cell at one or more points, 

 leaving the cytoplasm almost entirely in the bases of the den- 

 drites. The chromatin lies in a fine reticulum. There may be 

 two nucleoli. The tigroid substance is disposed in triangular 

 or irregular bodies of smaller size than those noted for the 

 striatum. These features are shoAin in Pig.*7. 



The nucleus postolf actorius receives many olfactory fibres 

 of the seconi order. A fibre entering for termination here is 

 seen in B'ig.36,ol.f. This nucleus evidently holds a very dif- 

 ferent place in the olfactory apparatus from the epistriatum. 

 The latter appears to be a sensory gateway to the striatum, 

 while the postolfactory neurones enter into direct relations 

 ^itn the posterior regions of the brain. 



•9. The nucleus fl europoricus , 

 A group of neurones situated in the region of the recessus 

 neuroporicus gives origin to a special bundle of the tractus 

 strio-thal amicus, the medianbu^del of Sdinger ('98). I shall 

 designate this group the nucleus neuroporicus. The neurones 

 of the nucleus neuroporicus lie chiefly behind tne external 



