MYCETES SENICULUS 



217 



and face has already been identified as a concomitant development depend- 

 ent upon the increase in functicMial capacity of the hand lor directing 

 locomotion. 



FIG. 119. MYCETES SENICULUS. LEVEL THROUGH THE MIDDLE OF THE 



INFERIOR OLIVE. 



DO, Dorsal Olive; dt, Deiterso-spinal Tract; cow. Ventral Spinocerebellar Tract; hel, Spino-olivary Tract of 

 Helweg; icp. Inferior Cerebellar Peduncle; 10, Inferior Olive; mf. Mesial Fillet; nb, Nucleus of Burdach; 

 NFS, Facial Nucleus; nhv. Nucleus Hypoglossus; nr. Nucleus of Rolando; nvd. Dorsal Vagal Nucleus; N12, 

 Hypoglossal Nerve; pd, Predorsal Bundle; PL, Posterior Longitudinal Fasciculus; py, Pyramid; ref. Reticu- 

 lar Formation; rst. Rubrospinal Tract; spt, Spinothalamic Tract; trd, Descending Trigeminal Tract; 

 vo. Ventral Accessory Olive; iv. Fourth Ventricle. [Accession No. 148. Section 145. Actual Size 13X6 mm.] 



LEVEL THROUGH THE MIDDLE OF THE INFERIOR OLIVE (pIG. I 1 9) 



At the level through the middle of the inferior olive (10) it is evident 

 that the unfolding which has occurred in the olivary body is considerable. 

 Not only is there an increase in size, but there is also a tendency for this struc- 

 ture to assume the characteristic outline which identifies it in the higher 

 species. It has, however, little of the convoluted appearance so prominent in 

 the larger simians. It is now possible to recognize the main olive and several 



