218 THE FIFTH P'AIE OF NERVES. 



divided the superior maxillary branch on both sides, 

 the animal losing the power of using the lips; that 

 Mr. Mayo divided the root of both the superior and 

 inferior maxillary, the result being that the lips no 

 longer remained in perfect apposition, and the animal 

 ceased to use them in taking up his food; that the 

 sensitive root, or a portion of it, after entering the cav- 

 ernous sinus, swells out into or passes through a gan- 

 glion, and that the motor root can be traced beyond 

 the ganglion, uniting afterward with its fellow and 

 forming the perfect nerve; that the ganglion, being 

 composed of sensitive fibrils only, resembles a brain. 



minal swelling appears to occupy different parts of tlie smootli 

 muscular fiber, but most frequently to be in the neighborhood 

 of the nucleus, or at the surface of the fibers, or, lastly, between 

 them." — The Monthly Microscopical Jouriod, 1S70. 



"Structure of Nerves. — M. Roudanoosky says that the 

 primitive elements of nerves are tubes having a pentagonal or 

 hexagonal configuration. As to their constitution, he says that 

 every nerve has a substratum of brain-matter, and also of the 

 spinal marrow, and probably of the ganglionic matter also. The 

 gray matter, he says, is the fundamental nervous substance, and 

 plays the principal part in the functions." — " Veterinarian," 

 1S65, p. 313. 



In a letter to his brother, G. J. Bell, written in 1807, Sir 

 Charles says : " I consider the organs of the outward senses as 

 forming a distinct class of nerves. I trace them to corresi^ond- 

 ing ])arts of the brain, totally distinct from the origin of the 

 others. I take five tubercle s within the brain as the internal 

 ssnses. I trace the nerves of the nose, e3'e, ear, and tongue 

 to these. Here I see established connection ; there, the great 

 mass of the brain receives processes from the central tubercles. 

 Again, the great masses of the cerebrum send down processes 

 or crura, which give off all the common nerves of voluntary mo- 

 tion. I establish thus a kind of circulation, as it were." — Medi- 

 cal Gnzcttj. 



