128 



the sensory neurones chaining the olfactory ort'in to it con- 

 stitute one arrr, and the neurones intervening betvfeen it -inj 

 the body nusculature comprise the other. 



0. Vuoleus Postal faotor'iis . -- The nucleus postolf acto- 

 rius is a collection of neurones at the ventro-lateral sur- 

 face of the striatum near its anterior end (B'ii^.?!, n.po.). 

 This nucleus is sharply demarcated from the general striatum 

 by the closeness .vith flhich its neurones are arranged; Pi^.?''. 

 shofls the morphology of fi\?e neurones as they lie in place. 

 The peripheral zone is occupied by fibres, and also by the 

 dendritic tips of the neurones themselves. The cell-bodies 

 lie in a densely matted tangle of nervous processes just in- 

 ternal to the peripheral layer. A cell-body is somewhat lar- 

 ger than one from the epistriatum. The form ranges from py- 

 ramidal to elongated oval. The dendrites are rather fe/» in 

 number, relatively short, branching dichotomously once or twic<^ 

 They are usually stout processes, gnarlei, rough, and irreg- 

 ular, with bit few true gemmules. Some neurones send their 

 dendrites radiately in all directions; others take a more or 

 less tangential course; still others are extended between the 

 zone of nerve-fibres at the periphery and the striatum within. 

 A conspicuously felt-like tangle is thus given by all of these 

 interlacing dendrites. 



The axone arises from one of the dendrites, so far as ob- 

 served. It passes into the tractus olf acto-habenularis, cours- 



