46 THE LOWER PRIMATES 



regulation ol volitional movements. The dorsal eoiumns of'Goll and Buidaeh 

 (CG, CB) are considerably increased in extent due to the presence in 

 them of nuclear masses constituting the nucleus of Goll (NG) and the 



FIG. 23. LEMUR MONGOZ. LEVEL OF CAUD.\L EXTREMITY OF INFERIOR OLIVE. 



CB, Column of Burdach; cen, Central Gray Matter; CG, Column of GoII; dt, Deiterso-spinal Tract; fai. 

 Internal Arcuate Fibers; fle. Dorsal Spinocerebellar Tract; cow. Ventral Spinocerebellar Tract; lo. Inferior 

 Olive; NB, Nucleus of Burdacli; ng. Nucleus of Goll; nr. Nucleus of Rolando; pv, Pyramidal Tract and 

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

 Trigeminal Tract. [Accession No. 147. Section 75. Actual Size, 10X6 mm.] 



nucleus of Burdach (NB). It is evident that the nucleus of Goll is 

 smaller than that of Burdach. This appearance bears out the point already 

 made as to the sensorj^ predominance of the more lateral of the two bundles in 

 the dorsal field. The fibers representing the hand and arm are more numerous 

 and constitute a more conspicuous bundle than those representing the leg. 

 In a similar manner, the substantia gelatinosa of Rolando (,NR), as well 



