526 THE NERVOUS SYSTEM. 



of pain (Longet). Yet, if any of its crura be touched, pain 

 is indicated ; and, if the restiforni tracts of the medulla 

 oblongata be irritated, the most acute suffering appears to 

 be produced. Its removal or disorganization by disease is 

 also generally unaccompanied with loss or disorder of 

 sensibility ; animals from which it is removed can smell, 

 see, hear, and feel pain, to all appearance, as perfectly as 



Fly. 148.* 



before (Flourens; Magendie). So that, although the resti- 

 form tracts of the medulla oblongata, which themselves 

 appear so sensitive, enter the cerebellum, it cannot be re- 

 garded as a principal organ of sensibility. 



In reference to motion, the experiments of Longet and 

 most others agree that no irritation of the cerebellum 

 produces movement of any kind. Remarkable results, 



* Fig. 148. Outline sketch of a section of the cerebellum, showing 

 the corpus dentatum (from Quain). f. -The section has been earned 

 through the left lateral part of the pons, so as to divide the superior 

 peduncle and pass nearly through the middle of the left cerebellar hemi- 

 sphere. The olivary body has also been divided longitudinally so as to 

 expose in section its corpus dentatum. c r, cms cerebri ; /, fillet ; q, 

 corpora <|uadrigemina ; sp, superior peduncle of the cerebellum divided ; 

 m p, middle peduncle or lateral part of the pons Yarolii, with fibres 

 passing from it into the white stem ; av, continuation of the white stem 

 radiating towards the arbor vita? of the folia ; c d, coi-pus dentatum ; 0, 

 olivary body with its corpus dentatum ; p, anterior pyramid. 



