THE MAMMALIAN NERVOUS SYSTEM 



83 



BN A 

 Ala lobuli centralis 



Lobulus centralis 



Oilmen monticuli 



Pars anterior lobuli 

 quadrangularis 



Pars posterior lobuli 



quadrangularis 



Declive monticuli 



Lobulus semilunaris 

 superior 



BOLK 



Lobus anterior 



Sulcus primarius 

 Lobulus simplex 

 S. pel. 



Lobulus ansiformis 



Fig. 13. — The human cerebellum from above. 



Lobus anterior 

 Cerebellar peduncles 



Flocculus 



Sulcus 



uvulo-nodularis 

 Lobulus 



paramedianus 

 Fissura secunda 



Lobulus 

 ansiformis 



Lobulus centralis 

 Ala lobuli centralis 

 Brachium pontis 

 Flocculus 

 Brachium 

 conjunctivum 

 Nodulus 

 Uvula 

 Tonsilla 

 Lobulus biventer 

 Pyramis 

 Tuber 

 Lobulus semi- 

 lunaris inferior 

 Sulcus horizontalis 

 Lobulus semilu- 

 naris superior 



Fig. 14. — The human cerebellum from below. 



In these two diagrams the principal subdivisions of the cerebellum are 

 indicated and the B N A names' are designated at the left. At the right 

 are the names given by Bolk to these structures and one fissure not named 

 by Bolk, the sulcus postclivalis (S.pcL), as named by Symington in Quain's 

 Anatomy. The sulcus primarius of Bolk and Kuithan is the same as the 

 furcal sulcus of Stroud, the fissura prima of Elliot Smith, and the sulcus 

 precHvalis of Symington. The lobulus simplex of Bolk extends across the 

 median plane and includes the declive of the B N Am the vermis. 



The functional localization within the cerebellar cortex as determined 

 by Bolk, Rynberk, and others is also indicated on the figures. Head 

 movements are controlled in the lobus anterior of Bolk, i. e., all parts in 

 front of the sulcus primarius. The lobus simplex controls neck move- 

 ments. Arm and leg movements are controlled in the lobus ansiformis and 

 trunk movements in the inferior vermis. 



cerebellum to the inferior surface. Centers for bilaterally 

 coordinated movements of paired groups of muscles are median 

 and unpaired. The centers for the motor control of each limb- 



