LEMUR iMONGOZ ^^ 



the cerebellum also appears at this level, the middle ccrthellar peduncle. 

 The significance of this peduncle becomes more evident at the higher levels 

 of the stem. Functionally it is the final connecting link between the cerebral 



FIG. 20. LEMUR MONGOZ. LEVEL OF EMERGENT FIBERS OF SIXTH NERVE. 



CEN, Central Gray Matter; ctt, Central Tegmental Tract; GOW, Ventral SpInocerebellarTract; icp. Inferior 

 Cerebellar Peduncle; nr. Nucleus of Rolando; n6, Abducens Nerve; pd, Predorsal Bundle; PL, Posterior 

 Longitudinal Fasciculus; pv, Pyramid; ref, Reticular Formation; rst. Rubrospinal Tract; so, Superior 

 Olive; SPT, Spinothalamic Tract; trd, Descending Trigeminal Tract; trp. Trapezoid Body. [Accession 

 No. 147. Section 173. Actual Size, 15 X 5 mm.] 



hemispheres and the lateral lobes of the cerebellum. The inferior cerebellar 

 peduncle has begun to spread out its fasciculi like a fan as it enters the 

 medullary substance of the cerebellum immediately lateral to the dentate 

 nucleus. Much significance attaches to the physiological importance of these 

 three cerebellar peduncles. Collectively they constitute a reliable index for 

 estimating the degree of coordination possessed by the animal, and thus 

 reveal the extent to which the more complex muscular performances have 

 been developed. The size of the inferior cerebellar peduncle provides a 



