130 VETERINARY PHYSIOLOGY 



paired muscles — the anterior part with the movements of 

 the eyes, tongue, and muscles of the face ; the middle part 

 with the muscles of the neck ; and the posterior part with 

 the synergic movements of the hind limbs in walking, etc. 



The lateral lobes seem to be connected with the inde- 

 pendent movements of the limbs of the same side. These 

 various parts are concerned, not with special anatomical 

 groups of muscles, but with definite co-ordinated movements. 

 Removal of a part concerned with the movements of a limb 

 in one direction is accompanied by a spontaneous deviation 

 in the opposite direction. 



4. General Conclusions — 



1. The cerebellum, through the influence of the in- 

 coming fibres from the labyrinths and probably also from 

 the spinal proprioceptive mechanism keeps up a con- 

 stant to7iic infiuence on certain of the Tiiusclei^ of the 

 body. 



2, It is a great central mechanism of rejiex adjust- 

 ment of the balance when disturbed in any way. In per- 

 forming this function, its action is guided by incoming 

 impressions (1) from the labyrinths (p. 121) ; (2) from the 

 spinal proprioceptive mechanism (p. 105) ; (3) from visual 

 impressions received through the cerebrum (p. 165) ; and 

 (4) from tactile impressions. It acts upon the spinal 

 reflex arcs to modify and regulate their action upon the 

 muscles. 



It may thus be described as a ganglion superimposed 

 upon the brain-stem which associates incoming impulses to 

 secure tonic maintenance of the balance and appropriate 

 readjustment of tlie balance without consciousness being 

 involved. 



III. DISTANCE RECEPTORS OF THE HEAD. 



We have now studied — 



1. The ordinary reflex response through the spinal arcs 

 to stimulation of receptors (p. 82). 



2. The way in which this is modified by the stimulation 

 of muscle-joint receptors (p. 105). 



