EXAMINATION OF THE NERVOUS SYSTEM 



231 



Fig. 92. — /., shows superior portion of the cerebrum; II., the lateral surface; and /., //., ///., 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 limb; 4, for the muscles 

 of the posterior Umbs; 5, for the facial muscles; 6, for the lateral movements of the tail; 7, for the re- 

 traction 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; /., t, the 

 heat-centre of Eulenberg and Landois. (Landois.) 



Fig. 92. — //., a, a, retraction and elevation of the corners of the mouth; b, opening of the mouth 

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



