The Brain. 



229 



larynx, and are distributed to the heart, lungs, and 

 stomach. 



11. The eleventh pair arise in part from the spinal cord outside of 

 the cranial cavity, enter the skull, and pass out again to supply certain 

 muscles of the neck and shoulders. 



12. The last pair of cranial nerves, the twelfth, supplies the muscles 

 of the tongue, and are called the hypoglossal nerves. 



Gray and White Matter of the Brain. 

 The gray matter of the brain is com- 

 posed of cells similar to those of the 

 spinal cord, while the white matter 

 of the inner part is composed of white 

 fibers like those of the outer part of 

 the spinal cord, or of the nerves. 



Ganglions of the Brain. There are several masses of 

 gray matter in the interior of the brain. These are the 



ganglions Of the _^^^ A .- Gray Matter 



brain. The white 

 fibers inside the 

 brain connect the 

 gray matter of 

 the convolutions 

 and these gang- 

 lions with all parts 

 of the body 



through the Spinal Fig. 91. Diagram of the Brain, showing the Spinal Cord, 

 P/-VJ- A Ganglions, and Course of the Fibers. 



Functions of the Cerebrum. The gray matter of the 

 outside of the brain is the central organ of intelligent sen- 

 sation and motion. The functions of volition, or willing, 

 of consciousness, of intelligence, seem to reside in, or rather 

 to depend upon the activities of, the cells of the gray 

 matter of the convolutions of the cerebrum. 



Ganglions 



Cerebrur 



Cerebellum 



