NERVES AND EPITHELIUM OF AMPULLA AND SACCULI. 119 



A difference in the course of the nerves in the very slightly 

 thickened tunica propria of the macula acustica of the sacculus, 

 as Henle has already pointed out, exists in the circumstance that 



Fig. 315. 



Fig. 315. Transverse section of the ampulla of Cyprinus carpio. 

 1, Roof of the ampulla ; 2, lateral wall of the ampulla ; 3, thickening 

 of the lateral wall corresponding to the planum semilunare ; 4, 5, 6, 

 thickened floor of the ampulla, with the nerves ; 7, nerve epithelium ; 

 8, columnar cells ; 9, planum semilunare ; 10, the structureless bodies 

 seated upon the epithelium ; 11, pavement epithelium ; 12, cupula 

 terminalis. 



they do not pursue the same linear course as in the ampullary 

 crest ; in other respects similar histological relations may be 

 observed between the nerve and epithelium as in the ampullae. 



