STRUCTUKE OF THE LABYRINTH. 



FIG. 316. LONGITUDINAL SECTION OF AN AMPULLA THEOUGH THE CRISTA ACUSTICA. 



amp., cavity of the ampulla ; sc.c., semicircular canal opening oxit of it ; c, connective tissue 

 attached to the wall of the membranous ampulla and traversing the perilymph ; e, e, 

 flattened epithelium of ampulla ; h, auditory hairs projecting from the columnar cells 

 of the auditory epithelium into the cupula, cup. term. ; v, blood-vessels ; n, nerve-fibres 

 entering the base of the crista and passing into the columnar cells. 



FIG. 317. AUDITORY EPITHELIUM FROM THE MACULA ACUSTICA OF THE SACCULE 

 OF AN ALLIGATOR. (Retzius.) (Highly magnified.) 



c, c, columnar hair-cells ; /, /, fibre-cells ; n, nerve-fibre, losing its medullary sheath and 

 passing to terminate in the columnar auditory cells ; A, auditory hair ; h', base of 

 auditory hairs, split up into fibrils. 



