458 THE NERVOUS 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 (f). 
The Peduncles of the Corpus Centrale descend one on either 
Fic. 59.—Four figures of the corpus centrale of the Blow-fly: 1. 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 aboye, 
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. 
DESCRIPTION OF PLATE XXXI. 
Fic. 1.—A frontal section of the brain of the Blow-fly, through the anterior part of 
the corpus centrale: 0 s, the optic peduncle. The other references as in Plate 
XXX. 
Fic, 2.-—A similar section through the middle of the corpus centrale, showing its 
inner and outer capsules. References as in Fig. 1. 
Fic, 3.—A lateral section through the brachia and corpus centrale: 47, ér, the 
brachia ; /, f corpora fungiformia ; ¢, pyramidal ganglion. 
