CEREBELLUM. 



577 



sensation,) and the fourth, formed of the posterior and sensorial 

 half of this lateral column, united to the posterior column of the 

 spinal marrow, which forms the corpus restiforme. 

 . Fig. 224 * 



* Fig. 224, is a representation of the cerebellum, and a part of the base of 

 the brain, showing especially the course of the anterior columns of the spinal 

 marrow, to their termination on the hemispherical ganglia. A, A, Antero- 

 lateral column of the cord continued on to the hemispheres of the cerebrum. 

 B, Corpora pyramidalia, the decussating fibres of which are seen. C, Corpora 

 olivaria. D, Pons varolii. F, Crus cerebri, g, Anterior cerebral ganglion or 

 corpus striatum. H, Cineritious or cortical neurine of the hemispheres forming 

 ■what have been called the hemispherical ganglia. 1, Cerebellum, a, Olfactory 

 nerve, b, Optic nerve ; on its outer side, I, I, are seen the white fibres expand- 

 ing into the base of the middle lobe, c. Fourth nerve, d, Sensory root of the 

 fifth pair of nerves, e, Roots of the facial and auditory nerves. /, Anterior 

 commissure, h, Eminentia mammillares ; on the left side the cineritious 

 matter is scraped away so as to show the origin of the fornix from it in front, 

 and a medullary band going on the inner face of the optic thalamus, i, to the 

 corpus geniculatum externum, from which the root of the optic nerve has been 

 cut. k, Trunk of the fifth pair as it emerges through the transverse fibres of 

 the pons, D, which form the commissure of the cerebellum. On the opposite 

 side, these transverse fibres have been removed, to exhibit the passing of the 



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