THE CEREBELLUM. 



247 



cleus has lost its superficial position and been overgrown by the 

 greatly expanded hemispheres. The course and destination of the 

 brachium in mammals and Petromyzon (p. 117) suggests com- 

 parison with the ascending fibers of the lemniscus system (cf. p. 

 258). 



NUCLEI TECTI, GLOBOSUS AND EMBOLiFORMis. The fiber con- 

 nections of these nuclei are not well understood. The nucleus 

 tecti is known to receive part of the fibers of the vestibular nerve 

 and of the external arcuate fibers from the nuclei of the dorsal 

 funiculi. A connection between the nucleus tecti and the superior 

 olive of the pons has been described. The conflicting descrip- 



Nuc. dentatus 



Nuc. emboliformis 

 Nuc. globosus 

 tecti 



FIG. 126. A transverse section through the deep gray nuclei of the cerebellum 

 of man. V, the radix mesancephalica V; VIII, root fibers of the vestibular nerve 

 going to the cerebellum; B, the position of Bechterew's nucleus; D, the position 

 of Deiter's nucleus. 



tions of the direct cerebellar tract do not allow us to decide whether 

 it is confined to the deep gray or extends also to the overlying 

 cortex of the anterior lobe. It seems certain, however, that the 

 nucleus globosus and nucleus emboliformis are related to this 

 tract and that the commissure which runs through these nuclei 

 is formed either by the fibers of this tract or by neurites arising 

 from these nuclei. It seems probable that these nuclei may 

 represent the secondary gustatory nucleus of the cerebellum of 

 lower vertebrates. Nothing is certainly known about gustatory 



