5io 



THE NERVOUS SYSTEM. 



tracts of which each half of the spinal cord is made up. 

 The columns are more prominent than those of the spinal 

 cord, and separated from each other by deeper grooves. The 

 anterior, continuous with the anterior columns of the cord, 

 are called the anterior pyramids; the posterior, continuous 

 with the posterior columns of the cord, are called the restiform 



Fig. 143.* Fig. 144. f 



* Fig. 143. View of the anterior surface of the pous Varolii, and 

 medulla oblongata. , a, anterior pyramids ; 6, their decussation ; c, c, 

 olivary bodies ; d, d, restiform bodies ; c, arciform fibres ; /, fibres 

 described by Solly as passing from the anterior column of the cord to 

 the cerebellum ; g, anterior column of the spinal cord ; 7i, lateral 

 column ; p, pons Varolii ; i, its iipper fibres ; 5, 5, roots of the fifth 

 pail- of nerves. 



f Fig. 144. View of the posterior surface of the pons Varolii, cor- 

 pora quadrigemina, and medulla oblongata. The peduncles of the 

 cerebellum are cut short at the side, a, a, the upper pair of cor- 

 pora quadrigemina ; &, b, the lower ; /, /, superior peduncles of the 

 cerebellum ; c, eminence connected with the nucleus of the hypoglossal 

 nerve ; e, that of the glosso-pharyngeal nerve ; z, that of the vagus 

 nerve ; d, d, restiform bodies ; p, p, posterior pyramids ; v, v, groove 

 in the middle of the fourth ventricle, ending below in the calamus 

 scriptorius ; 7, 7, roots of the auditory nerves. 



