SYSTEMATIC ANALYSIS OF THE BODY. 



31 



3d, The muscles must be connected with the central 

 Ganglia by nerves ; 



4th, The whole must be covered with skin, also to 

 be connected with the central Ganglia by nerves ; and 



FIG. 49. 



Fig. 49 is a beautiful representation of the superficial nerves of the 

 right Head and Neck, which will be particularly interesting to those 

 troubled with neuralgia of the face, since they can appreciate the fact that 

 if a main branch of the nerves is affected, the pain may seem to be at 

 many points, though most of the nerves shown are motory ; 1, being the 

 Facial, through which the muscles of the face are controlled by the will, 

 and the avenue through which they are a.cted upon by the emotions and 

 expressions caused. The bunch of nerves, 25, Infra-orbital, and 27, Infe- 

 rior-dental, extending to the upper and lower lips, are especially noticeable. 



Describe Fig. 47. Of what are the Walls of the Head composed, 2d ? 3d ? 4th ? 

 Describe Fig 48. Describe Fig. 49. 



