174 



COMPARATIVE ZOOLOGY. 



The medulla oblongata is not only the medinm of com- 

 munication between the brain and the spinal cord, but it 



Pi8. 142.— Brain of the Cnt {FeUa do- 

 me€tica): a, medulla oblongata; b, 

 cerebellnni; c, cerebrum.. 



Fio. 143. — Biain of the Orang-ntan, 

 npper surface; oiie third natural 

 size. 



is itself a nervous centre : the brain above and the cord 

 below may be removed witliout death to the animal, but 

 the destruction of tiie medulla is fatal. Of the twelve 

 pairs of nerves issuing from the contents of the skull (en- 

 cephalon), ten come from the 

 medulla oblongata. Among 

 these are the nerves of hearing 





Fig. 144.— Human Brain, side view: 1, 

 inedulld oblongata ; 3, cerebellum ; 6, 

 frontal convolutions of cerebrum. 



Pig. 146. — Human Brain, npper view, 

 one fonrth natnral size: 1, anterior 

 lobes ; 2, posterior; 8, great median 

 Assure. 



and taste, and those that control the lungs and heart. Kes- 

 liiratlon ceases immediately when the medulla is injured. 



