456 



PHYSIOLOGY 



(3) Tremors or rhythmical movements of the muscles on the same 

 side accompanying any willed movements. 



These three symptoms are denoted by Luciani as asthenia, atonia, 

 and astasia. At first the animal is quite unable to stand and lies 

 on the side of the lesion with neck and trunk curved in the same 

 direction ; when it attempts to stand it always falls to the same 

 side. After two or three weeks the power to stand is regained, 



Sup.Vermis 



V-C.V.T. 



C.R.--;- 



FIG. 202 A. Schema of connections of Deiters' nucleus. ( BRUCE. 

 CR, restiform body ; EN, roof nuclei ; SF, sagittal fibres from cortex to 

 roof nuclei ; CVT, cerebello-vestibular tract ; DN, Deiters' nucleus ; in, vi. 

 nuclei of third and sixth nerves ; PLF, posterior longitudinal bundle ; viu, 

 vestibular division of eighth nerve ; so, semicircular canals ; VST, vestibulo- 

 spinal fibres. 



though when it attempts to walk the hindquarters drag and tremors 

 and oscillations accompany every effort. The animal attempts to 

 correct the tendency to fall towards the side of the lesion by an 

 exaggerated abduction of the limbs to that side, and is always ready 

 to take advantage of the support of a wall to enable it to maintain 

 its equilibrium. Swimming is much better carried out than walking, 

 the contact of the water with the skin furnishing guidance to the 

 spinal mechanism which is lacking when the animal attempts to walk. 

 When the whole cerebellum is removed the animal is unable to 

 walk, sometimes for months. After a time it gradually learns to 



