458 



THE XERVOUS SYSTEM. 



The capsule is connected with the mesocerebron by the 

 brachia, and by a number of radiating fibres, which ascend 

 from the crura and leave its convex surface : these fibres cross 

 each other in various directions, after their exit from the 

 capsule, and form what Viallanes terms the atmosphere fibreuse 

 in the layer of gray substance around it. The lower part of 

 the ellipsoid body is connected with the crura of the cerebron 

 by a pair of peduncles (p}. 



The Peduncles of the Corpus Centrale descend one on either 



*. 



Fir.. 59. Four figures of the corpus centrale of the Blow-fly : i. A sagittal section of 

 the corpus centrale. 2. A semi-diagrammatic stereographic representation of 

 the corpus centrale seen from in front. 3. A similar figure seen from above, 

 showing the procerebral lobes. 4. A similar lateral view of the corpus centrale. 

 The lettering is the same as in the plates and other figures. 



side, and enter the crura. The fibres of which they are formed, 

 after traversing the ellipsoid body, decussate with each other, 

 and spread out like an open fan in the capsule. Many of 

 them pass out by the posterior surface of the capsule, and 

 after traversing the gray layer which surrounds the corpus 

 centrale, enter the inner surface of the hemispheres or ter- 

 minate in the pyramidal ganglion. The fibres of the fillet of 

 the nodulus are so intermixed with those of the peduncles of 

 the corpus centrale that they cannot be traced separately. 



I >i- 31 Kirrin.N in Pi \ 1 1. XXXI. 



Fi<;. i. -A frontal section of the brain of the Hlo\v-fly, through the anterior part of 



the corpus centrale : o s, the optic peduncle. The other references as in Plate 



XXX. 

 Fi<;. 2. A similar section through the middle of the corpus centrale, showing its 



inner and outer capsules. References as in Fig. I. 

 FK.. 3. A lateral section through the brachia and corpus centrale : (', l>r, the 



brachia : /,/ corpora funriforniia ; ;, pyr.nnidal g.inglion. 



