CONNECTIONS OF CEREBELLUM 



857 



median line, and then pass down first in the tegmentum, and below that 

 in the lateral column of the bulb and cord. On their way they come 

 into relation with the motor nuclei of the cranial nerves, and in the 

 cord with the cells of the anterior horn. It is obvious that in contrast 

 to the projection fibres the fibres of the rubro-spinal, vestibule-spinal, 

 olivo-spinal, and thalamico-spinal tracts (p. 839) and the posterior 

 longitudinal bundle connect the brain stem or cerebral axis with the 

 cord, or different levels of the brain stem with each other. 



Connections of the Grey Matter of the Cerebellum with the Periphery 

 and other Parts of the Central Nervous System. Numerous as are the 

 nervous ties of the cerebral cortex, those of the grey matter of the 

 cerebellum are, in proportion to its mass, still more extensive, particu- 

 larly as regards afferent fibres, and perhaps not less important. 



Speaking broadly, we may say that the restiform body or inferior 

 peduncle connects chiefly the dentate nucleus and the grey matter of 

 the worm with the spinal cord and medulla oblongata, and through 

 them with the periphery. The fibres which it receives from the direct 



Fig. 352. Direct Sensory Cerebellar 

 Path of Edinger. D, Betters' 

 nucleus; v, median nucleus of 

 auditory nerve; t, nucleus of the 

 roof; g, nucleus globosus. 



Fig. 353. Diagram of Dorsal and Ventral Spino 

 Cerebellar Tracts entering Cerebellum (Mott). 

 P.C.Q., posterior corpora quadrigemina; s.v., 

 superior vermis of cerebellum; d.a.c., v.a.c., 

 dorsal and ventral ascending cerebellar tracts. 



cerebellar tract (dorsal spino-cerebellar tract) of its own side it carries 

 to the worm. These fibres occupy the outer portion of the peduncle. 

 The fibres which reach the restiform body from the olivary nucleus of 

 the opposite, and also in smaller numbers from that of the same side, 

 run mainly to the hemisphere. All these fibres are afferent in relation 

 to the cerebellum (cerebello-petal) . An uncrossed afferent connection 

 also exists between the cerebellum and the vestibular branch of the 

 auditory nerve, through certain of its nuclei of reception, and also 

 between it and the nuclei of other cranial nerves, such a^ the trigeminus 

 and the vagus. The fibres pass up in the inner portion of the inferior 

 peduncle (direct sensory cerebellar path of Edinger, Fig. 352) to the 

 nucleus of the roof (nucleus tecti) and nucleus globosus. Some efferent 

 fibres (cerebellofugal) also run down from the cerebellum in the inferior 

 peduncle, including fibres from the nucleus tecti of the opposite skle 

 which are on their way to the medulla oblongata. 



