428 ANATOMY AND PHYSIOLOGY OF THE BEALET. 



some extent the circulation in the cerebrum and its nutri- 

 tion, and that injuries of the former will, by modifying 

 the latter, lead to various abnormal influences in different 

 parts of the body. Among these he enumerates amaurosis, 

 vomiting, headache, dilatation of the pupils, local or general 

 convulsions, epilepsy, and hemiplegia, all of which occur 

 also from certain conditions of the viscera, as in intestinal 

 worms. In each case, he supposes the brain and oblong 

 medulla as the immediate agent, acting under the influence 

 of the cerebellum or intestines, as the case may be. Many 

 symptoms, accordingly, noticed as resulting from injuries of 

 the cerebellum, are not attributable to it as a separate 

 nervous centre, but rather to the influence it exerts on 

 those adjacent. 



The different parts of the brain proper seem entirely 

 destitute of sensibility, and may be cut away piecemeal 

 without inducing the slightest indication of pain. The 

 irritation of certain parts, however, gives rise to convulsive 

 movements of various kinds, and the most remarkable is 

 that of turning or rotation of the animal on its longitudinal 

 axis. It is found that irritation or transverse section of 

 one pillar of the cerebrum near the optic thalami causes 

 the subject to roll over and over from the wounded to the 

 sound side, and this movement may continue uninter- 

 ruptedly for hours or days. Injuries to various other 

 parts induce a similar rotation, or a turning from one 

 side to the other, after the manner of a horse in a circus. 

 Brown-Sequard has tabulated the results of these injuries, 

 as follows : 



