NBKVOUS SYSTEM. 



347 



weight is about twonty-two ounces, in the sheep about five 

 ounces. It is ovoid in shape. Viewed on its superior surface 

 (fig. 196), we shall see the following areas, starting from behind, 

 where it joins the spinal cord : The meJulla or idhmus (B), a 

 kind of white peduncle running into the brain, the prolongation 

 as it wore of the spinal cord : following this is a grey ti-ilobed 



Fig. 197. — Brain of Horse (\entral view). 



01, Olfaitoiy lobes ; '.'1 and C2, cerebrum ; Cb, cerebellum ; M, medulla ; 02).C, optic 

 eliiasma; Pt, pituitary glaud ; Cc, crura cerebri ; P, pons Varolii; 1-10, roots of cranial 

 nerves. 



mass, the cerehellum (C), and in front of the cerebellum are seen 

 two other lobes separated by a deep fissure from the cerebellum 

 and from one another (1) ; these two lobes are the cerebral lobes, 

 the whole forming the cerebrum (2-14). The cerebral hemi- 

 spheres are more or less convoluted. On examining the under- 

 surface of the brain (fig. 197) it will be seen that the peduncle 



