ANATOMY AND PHYSIOLOGY OF THE BRAIN. 



429 



Parts producing Turning or Rolling after an Injury on the 

 Right Side. 



TURNING OR ROLLING BY THE 

 RIGHT SIDE. 



1. Anterior part of the optic thal- 



amus. (Schiff.) 



2. Hind parts of the eras cerebri. 



(Schiff.) 



3. Tubercula quadrigemina. (Flou- 



rens.) 



4. Posterior part of the middle 



peduncle of the cerebellum. 

 (Magendie.) 



5. Place of insertion of the audi- 



tory and facial nerves (Brown- 

 Se'quardand Martin Magron.) 



6. Neighbourhood of the insertion 



of the lower roots of the pneu- 

 mogastric nerve. (Brown- 

 Sequard.) 



TURNING OR ROLLING BY THE 

 LEFT SIDE. 



1. Posterior part of the optic thal- 



amus. (Schiff.) 4 



2. Some parts of the cms cerebri 



near the optic thalamus. 

 (Brown-Sequard.) 



3. Anterior and superior parts of 



the pons Varolii. 



4. Anterior part of the middle 



peduncle of the cerebellum. 

 (Lafargue.) 



5. Place of insertion of the glosso- 



pharyngeal nerve. (Brown- 

 Sequard.) 



6. Spinal cord near the oblong 



medulla. (Brown-Sequard.) 



Brown-Sequard remarks, that in some cases turning may 

 result from vertigo, but attributes it, in the great majority, 

 to spasms of the muscles on that side to which the animal 

 turns. The fibres conveying the impression are, in his 

 opinion, a special set, and quite distinct from those which 

 usually act under the control of the will. 



The corpora quadrigemina and corpora geniculata, which 

 are connected with the roots of the optic nerves, seem to 

 preside over the sense of sight, and destruction of these by 

 disease or otherwise invariably leads to blindness. Wasting 

 of the eyes may likewise induce diminution of these organs. 

 In either case, the effect takes place on the opposite side 

 thus, disease on the right side of the corpora quadrigemina 

 produces blindness of the left eye. 



