664 



THE HIGHER ANTHROPOIDS 



dorsal nucleus of the vagus (Nvd). A nuich sharper dcniarcatioii exists 

 between it and the twelfth nerve nueleus than is the case in the lower pri- 

 mates. Here again, even in these more arehaie and fixed structures such as the 



FIG. 300. GORILLA. LEVEL OF THE MIDDLE OF THE INFERIOR OLIVE. 



AMB, Nucleus Ambif^uus; cen. Central Gray Matter; do, Dorsal Accessory Olive; fle. Dorsal Spinocerebellar 

 Tract; cow, Ventral Spinocerebellar Tract; iiilL, Spino-olivary Tract of Helweg; 10, Inferior Olive; mf, 

 Mesial Fillet; nb, Nucleus of Burclach; NUi., Nucleus of Blunienau; NFS, Fasciculus Solitarius; ng. Nucleus of 

 GoII; NliY, Hypoglossal Nucleus; nr. Nucleus of Rolando; Nvo, Dorsal Vagal Nucleus; Nio, Tenth Cranial 

 Nerve; N12, Twelfth Cranial Nerve; i>d, Predorsal Bundle; pl. Posterior Longitudinal Fasciculus; pv, 

 Pyramid; ref. Reticular Formation; rst. Rubrospinal Tract; spt, Spinothalamic Tract; trd, Descending 

 Trigeminal Tract; vo. Ventral Accessory Olive; iv. Fourth Ventricle. [Accession No. J. D. Section 330. 

 Actual Size 18 X u mm.] 



cranial nerve nuclei, there is a greater degree of definition in the advanced 

 species of the primate order. This increasing definition of all the structures of 







