198 



DISEASES OF THE NERVOUS SYSTEM. 



FXG. 67. 



Fig. 57, 1,, shows superior portion of the cerebrum; II., the lateral surface ; and I., II., 

 III., IV. are the four convolutions. ; S, is the sulcus cruciatus; F, the fissure of Sylvius; 

 o, the bulbus olfactorius ; p. Is the optic nerve. The motor centres are : 1, for the muscles of 

 the neck ; 2, for the extensors and adductors of the anterior limbs ; 3. for the flexors and 

 rotators of the anterior limbs ; 4, for the muscles of the posterior limbs ; 6, for the facial 

 muscles ; 6, for the lateral movements of the tail ; 7, for the retraction and adduction of the 

 anterior limbs ; 8, for the lifting of the shoulder and extension of the front limb (walking) ; 

 9, 9, for the orbicularis palpebrarum, zygomaticus, and closing of the eyelid ; I., t, the heat- 

 centre of Eulenberg and Laudois. (Landois.) 



Fig. 57, II., a, a, retraction and elevation of the corners of the mouth ; 6, opening of the 

 mouth and movements of the tongue ; d, the opening of the eyelids. 



