PITHECUS RHESUS, MACACUS RHESUS 



369 



into the position ultimately oeeupieci by tlie lloor of the fourth ventricle. 

 Doi'sal to it, and adjacent to the dorsomedian septum, is a large nuclear 

 mass surrounded by a small capsule of medullary substance, the nucleus 



FIG. 173. MACACUS. LEVEL OF CAUDAL LIMIT OF INFERIOR OLIVARY NUCLEUS. 



CEN, Central Gray Matter; CB, Column of Burdach; cc, Column of Goll; dt, Deitcrso-spinal Tract; fle. 

 Dorsal Spinocerebellar Tract; cow, Ventral Spinocerebellar Tract; hel, Spino-olivary Tract of Helweg; 10, 

 Inferior Olive; mf. Mesial Fillet; nb, Nucleus of Burdach; nbl, Nucleus of Blumenau; ng, Nucleus of Goll; 

 NFL, Facial Nucleus; nr. Nucleus of Rolando; py. Pyramid; ref, Reticular Formation; rst. Rubrospinal 

 Tract; spt. Spinothalamic Tract; trd. Descending Trigeminal Tract. [Accession No. 149. Section 90. Actual 

 Size 11X8 mm.] 



of Goll (NG), lateral to which, and separated from it by the dorsal 

 paramedian sulcus, is the much larger nucleus of Burdach (NB). De- 



