NERVES AND EPITHELIUM OF THE AMPULLA AND SACCULI. 100 



in the ampullae, Steifensand closely studied it, in the year 

 1835, in Fishes, Reptiles, Birds, Mammals, and Man, and de- 

 monstrated that this process, varying in its form in different 

 animals, is produced by a peculiar inversion and thickening of 



Fig. 310. 



Fig. 310. Transverse section of the ampulla of the Pike. 1, Roof 

 of the ampulla ; 2, thin portion of the lateral wall ; 3, thick portion 

 of the lateral wall ; 4, 5, 6, floor of the ampulla, with the nerves ; 

 7, nerve epithelium ; 8, auditory hairs ; 9, transitional region be- 

 tween the floor of the ampulla, and 10, the planum semilunare ; 11, 

 pavement epithelium. 



the wall of the ampulla. M. Schultze applied to the septa 

 the certainly more accurate name of cristse acusticse in the 

 ampullae, and maculae acusticse in the sacculi. Every branch of 

 the nervus vestibuli that is distributed to an ampulla, dips, in 



