338 DISORDERS AFFECTING MOTION AND SENSATION. 



sile power in the lips, an awkward manner of drinking, and 

 some irregularity in mastication. 



Treatment. — The objects aimed at in all treatment of local 

 paralysis, whether extensive or limited, are to restore the genetic 

 force of the supply nerve, so that muscular contractility may be 

 resumed, and to obviate any tendency which may exist in the 

 tissues acted upon to destructive changes. The first of these 

 must all be moulded by the causes in operation in the produc- 

 tion of the nervous disturbance — which, in the common instance 

 noted, is pressure by head-gear — the latter by appropriate local 

 remedies. 



III. Disorders of Sensation. 



In our patients, from the inability we labour under to 

 appreciate subjective phenomena, disturbances or aberrations 

 of sensory power are placed more beyond our recognition than 

 impairment of motor energy. 



Hypwsthesia, blunting of common sensation, and ancesthesia, 

 complete loss of it, are conditions usually encountered with 

 the accompanying state of motor paralysis ; they seem, if less 

 readily developed and less distinctly marked than the co- 

 existing state of impaired motorial activity, to be intimately 

 associated with it in mode of production. In their distribu- 

 tion, when appearing, they present modifications as to locaHza- 

 tion precisely alike, and may, for the sake of distinction, be 

 similarly named. Hypercesthesia, exalted sensibility, we some- 

 times observe in certain diseases of the skin of the horse, and 

 probably also in some affections of the nervous system, organic 

 and functional. 



CHAPTER IV. 



DISEASES affecting THE CEREBRAL CIRCULATION. 



The diseases directly connected with the cerebral circulation 

 in the horse, although less numerous than in other of our 

 patients, are yet important enough to call for consideration. 

 Under this grouping of disturbance of the cerebral circulation 

 we will consider— 1. Cerebral disease attendant upon an over- 



