84 



LABORATORY OUTLINE OF NEUROLOGY 



separately lie laterally on the corresponding side of the cere- 

 bellum. 



The general arrangement of these functional regions is shown 

 in Figs. 13, 14, 15, and 16, though many details are still ob- 

 scure. In particular, it has not been possible to separate the 

 arm areas from the leg areas in man; but experimental studies 

 on other mammals suggest that the leg area lies inferior to the 

 arm area, as indicated in Fig. 14. The type of motor control 

 exercised by the cerebellum is evidently very different from that 

 of the motor centers of the cerebral cortex. The latter deter- 



Folium vermis 

 Declive monticuli 



Culmen monticuli 



Lobulus centralis 



Velum medullare - — 7 

 anterius 



Lingula 



Tuber vermis 



Pyramis 



Uvula 



Nodulus 



Tela chorioidea 

 ventriculi quarti 



Fig. 15. — A sagittal section through the vermis of the human cerebel- 

 lum. The B N A names of the parts are given and also the functional 

 localization as determined by Bolk, Rynberk, and others. The areas of 

 the head and neck extend lateralward as indicated on Fig. 13. The area 

 for control of movements of the trunk is limited to the inferior vermis. 

 The area for the limbs in the tuber vermis is for the control of coordinated 

 movements of both members of a pair, while the arm and leg areas shown 

 in Fig. 13 and 14 control the separate movements of these limbs. 



mines what movement is to be made; the former appears to 

 be concerned only with the synergic control of the muscles 

 whose activity is called forth by other centers. 



The nomenclature of the cerebellum is in great confusion, 

 each investigator having developed his own terminology. 

 In Figs. 13, 14, 15, and 16 the B N A names are indicated and 

 the names used by Bolk and some other more recent students 

 are given for comparison. 



On the structure, connections, and general functions of the 

 cerebellum consult especially the following works: Bailey 

 ('16), pp. 513-520; Cunningham (15), pp. 570-581; Herrick 



