OF DENISON UNIVERSITY. 



93 



b. Motor nucleus of Vth nerve. 



c. Sensory nucleus of Vth nerve. 



d. Nucleus of pons. 



e. Dorsal longitudinal bundles. 



f. Pyramidal tract. 



Ftg. 2. Magnified view of cells from the olivary body, Plate XVII e. Fig. 2. 

 Fig. 3. A transverse section of the medulla at the entrance of the fourth 

 nerve, in the region of the valve of Vieussens. 

 a. Nucleus of the pons, 

 h. Cell cluster in the median gray mass. 



c. Dense group of small cells in the median gray mass. 



d. Decussation of IVth nerve. 



e. Root of IVth nerve passing cephalad to its nucleus. 



f. Dorsal longitudinal bundles. 



g. Pyramidal tract. 



Fig. 4. Magnified cells from the nucleus of the pons, (VI.<--2S-a.) 

 Fig. 5. Magnified cells from central gray mass taken at /5, Fig. 3. 

 Fig. 6. A longitudinal vertical section taken near the side of the medulla 

 and embracing the lateral portion of the cerebellum. 



a. Root of Vth nerve. 



b. Inferior peduncle. 



c. Root of Vlllth nerve. 



d. Nucleus of Vlllth nerve. 



Fig.'']. Magnified cells from the central gray mass, taken at c, Fig. 3. 



PLATE XIX. 

 C. L. Herrick. 



Fig. I. Vertical longitudinal section of the hemisphere through the lateral 

 part of the optic chiasm. Pd. Peduncular fibres in the corpus striatum. Ac. An- 

 terior commissure. 01. tr. Olfactory tract. 0. tr. Optic chiasm, y. Nucleus 

 above the ventral tract. 2 isolated tract in the thalamus, c. si. Stratum zonale 

 Ftr. Descending tract of the nates. Np. Peduncular nucleus. V. Upper nucleus 

 of trigeminus Vi. Lower nucleus of trigeminus. VI/. Root fibres of facial 

 nerve. X. Nucleus of auditory nerve. 



Fig. 2. Horizontal longitudinal section at the level of the third roots and 

 anterior commissure. Anterior portion from a section a little higher than the re- 

 mainder. C.s. Corpus striatum. a.c. Anterior commissure. o.t.r. Olfactory 

 tract, /. Fornix tracts. Fd. Peduncular tracts radiating to the corpus striatum. 

 /. Fornix fibres passing dorsad, c.^. Corpus geniculatum. ///. Nucleus of ocu- 

 lo-motor nerve. IV. Nucleus of pathetic nerve, n. Interpathetic nucleus. Vi. 

 Motor nucleus of trigeminus. B.c. Bladder cells of trigeminus. V. Tract of 

 trigeminus from aqueduct, etc. Tii. Caudad nuclei of the trigeminus. Vr. 

 Root fibres of trigeminus. //. Cut section of dorsal tract to hemispheres. See 

 Fig. I, L. tr. 



