498 



THE NERVOUS SYSTEM 



cells, Deifers' nucleus. Still more lateral and just at the margin 

 of the central grey matter of the cerebellum, is the small-celled 

 nucleus of von Bechterew. These two nuclei, together with the 



FIG. 387. A SECTION OF THE HUMAN PONS VAROLII AT THE LEVEL OF THE TRIGEMINUS 



NERVE. 



BPo, middle cerebellar peduncle ; cH, central 4ract of the tegmentum ; dlH, dorso- 

 lateral tract of the tegmentum ; Flp, posterior longitudinal bundle ; fist, peduncle of the 

 flocculus ; fpPo, longitudinal pontine fibres ; Fprd, predorsal fasciculus ; LI, lateral lem- 

 niscus; Lm, mesial lemniscus; m, dorsal longitudinal bundle of Schiltz; mPy, cortico- 

 pontine tract; NaB, nucleus of von Bechterew; Nft, nucleus of the eminentia teres; 

 Nos, superior olivary nucleus ; Nrtg, reticular nucleus of the tegmentum; NVm, motor 

 trigeminal nucleus; NVs, sensory trigeminal nucleus; Po, pons; R Tr, radial fibres of 

 the trapezoid body ; So, peduncle of the superior olive ; Strc, middle layer of the pons ; 

 Strp, deep layer of the pons; Strs, superficial layer of the poiis; Tr, trapezoid body ; 

 Trs, rubro-spinal tract ; Tscv, Gowers' bundle ; Tst, spino-tectal and thalamic tract; V, 

 trigeminus ; Vc, cerebral root of the trigeminus ; Vllb, second portion of the facial root ; 

 VIIc, third portion of same ; Vs, crossed root of the trigeminus. Weigert's stain, x 3. 

 (After Marburg.) 



chief or mesial auditory nucleus, are connected with the path of 

 the vestibular nerve. 



In the lateral wall of the fourth ventricle is a transversely flat- 

 tened oval bundle of nerve fibres, which arises from the central 

 grey matter of the cerebellum and passes, as the brachium con- 



