THE NERVOUS SYSTEM. 17k 
will, but can not; its motions are irregular, and it acts as 
if intoxicated. It is largest in animals capable of the 
Fia. 140.—Brain of the Cat (Felis do- Fig. 141.— Brain of the Orang-utan, 
mestica): a, medulla oblongata; 0, upper surface; one-third natural 
cerebellum; c, cerebrum. size. 
most complicated movements: being larger in the Ape 
than in the Lion, in the Lion than in the Ox, in Birds 
than in Reptiles. 
The medulla oblongata is not only the medium of com- 
munication between the brain 
and the spinal cord, but it is 
itself a nervous centre: the 
Fre. 142. — Human Brain, side view: 1, Fig. 143.—Human Brain, upper view, 
medulla oblongata; 3, cerebellum; 5, one-third natural size: 1, anterior 
frontal convolutions of cerebrum. lobes; 2, posterior; 3, great median 
fissure. 
brain above and the cord below may be removed without 
death to the animal, but the destruction of the medulla 
