TRO(;i OD^TFS COR II LA 



675 



in its lateral cxtriiiiily tlu' mcscnccplialic root ol tlu' tri^H'niiiial lurvc. 

 Tlu' latc'ial walls arc I'ornuti h\ a diMisi' mass of liht'rs constituting the 

 suj)cri()r cerebellar peduncle (Sep), lati'ral to which is the tractus uncinatus 



FIG. 306. GORILLA. LE\ HL THKOIGH TIIL MIDDLE Ol HIE PONS \AK()Ln. 

 CEN, Central Gray Matter; li , Lateral I'illet; lix, Lingula; mc:p, Middle Cerebellar Peduncle; mf. Mesial 

 Fillet; N5, Trigeminal Nerve; I'l), Predorsal Hiindle; i>t , Posterior Longitudinal Fasciculus; pn. Pontile 

 Nuclei; pns. Pons; py, Pyramid; ref. Reticular Formation; scp, Superior Cerebellar Peduncle. [Accession 

 No. J. D. Section 580. Actual Size 30 X 19 mni.| 



of Russel, and overlying this is a thin stratum of libers, the ventral spino- 

 cerebellar tract, makin<j; its way toward the \crmis of the cerebellum. 



In the lateral portion of the pons Varolii, as its axons become collected 

 to form the middle cerebellar peduncle, libers Irom the dorsal root of the 

 trigeminal nerve (N5) penetrate the ])ons. These libers make their way 

 into the te<i;mentum where they terminate in relation with the cephalic 

 extremity of the substantia gelatinosa trigemini. The tegmentum pontis 



