130 PRACTICAL ZOOLOGY. 



3. Gently separate the cerebral hemispheres, and note 

 the transverse band of white fibres connecting them. 



4. Examine the under surface of the brain and find the 

 roots of the cranial nerves. 



The olfactory lobes (probably cut or broken off) 

 extend forward from the fore part of the cerebral 

 hemispheres. 



Note that the optic nerves join each other before 

 reaching the brain. Only the first and second pairs 

 of cranial nerves directly enter the cerebrum. 



Further back is the third pair of nerves. 



The fourth pair extend up on each side into the 

 groove between the cerebrum and cerebellum. 



Back of these is the larger fifth pair. This pair 

 supplies part of the face and sends branches to the 

 teeth. It is the nerve affected in neuralgia of the 

 face. 



Back of, and inside of, the fifth pair is the smaller 

 sixth pair. The third, fourth, and sixth pairs control 

 the movements of the eyeballs. 



The seventh pair are larger and are farther back 

 and outward. These are facial nerves, and control 

 the muscles of the face and the facial expression. 



Close to the seventh is the eighth or auditory 

 nerve. 



The ninth, tenth, and eleventh arise close together 

 further back, and well up on the side of the medulla 

 oblongata. 



The ninth supplies the back of tongue and the 

 pharynx, and is called the glosso-pharyngeal nerve. 



The tenth pair pass down out of the brain-cavity, 

 give off branches to the pharynx and larynx, and are 



