360 



MECHANICAL AND ACOUSTICAL SENSES 



superficial ophthalmic 



buccal 



IX x posterior nerve 

 external mandibular 



Figure 17 Innervation of the head canals of Squalus (modified from Norris and Hughes 

 1920). 



The region of the brain that receives the lateral-line nerves is dominated 

 by the cerebellum, which in these fishes consists of three portions: the 

 unpaired corpus, the paired auricles, and paired lateral-line lobes (Figure 18). 



1cm 



optic tectum 



lateral-line 

 lobes 



Figure 18 Dorsal view of the brain of Scyliorhinus. 



