828 



PHYSIOLOGY OF THE DOMESTIC ANIMALS. 



directions : part of the fibres communicate with the direct cerebellar 

 tract and others with the posterior columns, thus furnishing through 

 the restiform body a direct path to the cerebellum. Other fibres of 

 these roots cross the middle line of the cord a little above where the}' 



Fig. 359.— Scheme of the Brain. {Landois.) 



C C, cortex cerebri ; C 3, corpus striatum : N 1, nucleus leiitieularis ; T o, optic thalamus ; V. corpora 

 quad rise mi nsi ; P, peilunculus cerebri; II, tegmentum, and p, crusta ; 1 1, corona radiata of the corpus 

 striatum ; 2 2, of the lenticular nucleus ; ?, 3, of the optic thalamus ; 4 4, of the corpora quadrigemiua ; 5, 

 direct fibres to the cortex cerebri i Flechsigi ; <i (i, fibres from the corpora quadngemina to the tegmentum ; 

 m, further course of these Jibres ; 8 8 1 fibres from the corpus striatum and lenticular nucleus to the crusta 

 of the pedunculus cerebri ; M, further course of these: S S, course of the sensory fibres; R, transverse 

 section of the spinal cord ; v.W, anterior, and h.W, posterior roots ; a a, association system of fibres ; c c. 

 commissural fibres : II, transverse section through the posterior pair of the corpora quudritremina aud the 

 pcdunculi cerebri of man ; p. crusta of the peduncle ; s, substantia niger; v. corpora quadrigemina with a 

 section of the aqueduct ; III, the same of the dog ; IV, of an ape ; V, of the guinea-pig. 



enter, and some pass up in the lateral column in front of the pyramidal 

 tract, others into the posterior column, and still others ascend in the 

 gray matter on the opposite side of the cord. In the medulla the 



