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PHYSIOLOGY 



posterior or direct cerebellar tract. In the region of the dorsal nuclei, 

 however, it receives accession of fibres from the gracile and cuneate 

 nuclei of the same side and, through the superficial arcuate fibres, 



FIG. 185. Diagram to show the sources of the fibres making up the resti- 



form body. 



Ar.N, arcuate nucleus ; Ar fibres, arcuate fibres ; Pyr, pyramid ; 

 C.Sp Tract, direct cerebellar tract; C.01 fibres, cerebello -olivary fibres ; 

 Pl.B, posterior longitudinal bundle; DN, nucleus of Deiters; NB, nucleus 

 of Bechterew ; Ro.N, roof nuclei ; Vest.N, vestibular nerve. 



from the nuclei of the opposite side, and thus passes as a thick white 

 bundle into the cerebellum. Among these arcuate fibres are also 

 a number derived from the olivary body of the opposite side, known as 

 the cerebello- olivary fibres. On its way it is joined by a smaller 

 bundle, the ' internal restiform body,' which conveys fibres from 

 the vestibular division of the eighth nerve and also serves to connect 



