20 



LABORATORY OUTLINE OF NEUROLOGY 



r. ophthal. superfic. V 

 r. ophthal. superfic. VII 



u. terminalis 

 r. ophthal. profundus V 

 } Optic nerve (a. II) 



r. maxillaris V 

 r. mandib. V 



Supra-orbital trunk 



Infra-orbital trunk 

 Ganglion V 

 r. palatums VII 

 Gang, geniculi VII 

 Gang, later. VII 

 r. prespirac. VII 



Spiracle 



r. hyomandib. VII 



n. IX 

 n. X 

 r. lateralis X 



r. branchialis X 

 ■. intestinalis X 



Fig. 2. — Diagram of the brain and sensory nerves of the smooth dog- 

 fish, Mustelus canis, from above. Natural size. The Roman numerals 

 refer to the cranial nerves. The olfactory part of the brain is dotted, the 

 visual centers are shaded with oblique cross-hatching, the acoustico-lateral 

 centers with horizontal lines, the visceral sensory area with vertical lines, 

 and the general cutaneous area is left unshaded. On the right side the 

 lateral line nerves are drawn in black, the other nerves are unshaded. 

 This is a rough sketch, not drawn to scale. The arrangement of the nerves 

 differs in some respects from that of the spiny dogfish, Squalus acanthias, 

 as will be seen by comparison with Fig. 5. (From Herrick's Introduction 

 to Neurology.) 



