CENTRAL CONTROL OF POSTURAL REACTIONS 



031 



and in supiiiation. It is a functional rather than an anatomical localization. 



(3) When a center concerned in the movements of the limb in a certain 

 direction, e. g., to the right, is suddenly destroyed, a spontaneous devia- 

 tion is produced in the opposite direction (to the left). 



For further details see, the paper by Black. 30 



Compensation for Cerebellar Injuries. The final stage following 



Fig. 233. 



Fig. 234. 



Figs. 233 and 234 represent respectively the inferolateral and the posterior aspect of the human 

 cerebellum indicating certain cerebellar localizations according to Barany. (After Barany, from 

 Andre-Thomas et Durupt. Op. cit.) N. VII, Nervus facialis; N. IX, Nervus Glossopharyngeus; 

 N. XII, Nervus hypoglossus. 



The signs in the above diagram indicate the exact localization of the centers for the tonus of 

 the musculature concerned in some of the movements of the right arm and leg, marks the 

 center for downward movements of the arm; X, for abduction of the arm; O, adduction of the 

 hand; + adduction of the arm; , adduction of the hip. N. V. indicates Nervus trigeminus; 

 N. VI, Nervus abducens; N. VII, Nervus facialis; N. IX, Nervus glossopharyngeus; N. XII, 

 Nervus hypoglossus. (From Davidson Black.) 



the removal of cerebellar tissue is one in which compensation is made 

 for this loss by other parts of the nervous system, so that in time the 

 symptoms gradually tend to disappear. The initial disturbances in lo- 

 comotion and the improvement which comes with time are illustrated in 

 Fig 235, which represents the footprints of a dog from which the cere- 

 bellum has been removed. 



