NERVOUS SYSTEM. 99 



Q. Is the sympathetic properly termed a nerve? 

 *4. It is not one nerve; it is a series of nerves derived 

 from the ganglions or little brains. 



Of the Ganglions. 



Q. What are the ganglions? 



Jl. The ganglions are small bodies of a red or gray co- 

 lour, deeply situated along the vertebral column and well 

 protected; and from them are sent numerous nervous ra- 

 mifications. They are not moveable. 



Q. What do these ganglions or ramifications form ? 



Jl. That which is termed the great sympathetic nerve. 



Q. What ganglions are uniformly found? 



/?. The superior cervical, the semilunar, the ophthal- 

 mic; others are sometimes wanting. 



Q. What is the form of these bodies? 



#. They are irregularly formed ; sometimes round, or 

 flat. 



Q. Is the organization of the ganglion and cerebral 

 substance similar? 



Jl. They are not alike in this respect. The ganglions 

 are susceptible of the horny hardening as solids are; the 

 cerebral substance does not admit that change. The 

 ganglions are not fibrous, the cerebral substance is. 



Q. What is Scarpa's opinion of the organization of the 

 ganglions ? 



#. That they are a kind of expansion of the filaments 

 of the nerves. Bichat thinks not, but says they are homo- 

 geneous and sui generis. 



Q. How do the ganglions differ from the ganglionic 

 nerves ? 



