THE PONS VAROLII 



495 



fibres forms the ventral portion or crusta of the pons. Since the 

 transverse fibres of the pons Varolii pass directly into the cere- 

 bellum, these fibres may be considered as forming the middle 

 peduncles of this organ. 



Fie. 385. A SECTION THROUUH THE LOWER BOKDER OF THE PONS VAROLII OF THE 



HUMAN BRAIN. 



Brcj, brachium conjunctivum ; BPo, middle peduncle of the cerebellum ; ell, central 

 tract of the tegmentum ; Crst, restiform body ; Decl, declive ; Dca, anterior cerebellar 

 commissure; Emb, nucleus emboliformis;/c/b, cerebello-pontine fibres ; flst, peduncle 

 of the flocculus; glob, globular nucleus; Lm, mesial lemniscus; NaB, von Bechterew's 

 nucleus; Ndt, dentate nucleus of the cerebellum; Nod, nodulus cerebelli; Not, superior 

 olivary nucleus ; AY, nucleus tecti; NVII, facial nucleus; Nvm, motor nucleus of the 

 trigeminus; Nrtg, reticular nucleus of the tegmentum; Plchl, lateral choroid plexus ; 

 Po, pons Varolii; Py, pyramid ; Tr, trapezoid body; Va, bundle of Vicq d'Azyr; F7, 

 abducens nerve ; Vila, first portion of the root of the facial nerve ; VIII, auditory nerve ; 

 VIV, fourth ventricle; VNdt, capsule of the dentate nucleus. Weigert's stain, x 2. 

 (After Marburg.) 



In addition to those structures which are continued upward 

 from the medulla oblongata, the metencephalon contains the cen- 

 tral paths and nuclei of those cranial nerves which enter this region. 



