476 



Comparative Animal Physiology 



almost no resistance to the vibrations which pass into the endolymph. Vibra- 

 tion of the basilar membrane causes a movement of the hairhke processes of 

 the sense cell against the tectorial membrane, thereby probably giving rise 



ortery 



Spiral 



gonglion 



. Basilar 

 membrane 



Inner ptvilongeol oil 



^jtcr phalongeot cells 



FiK- 155. A, Vertical section of the human cochlea showing the organ of Corti and 

 adjacent structures. B, The organ of Corti and the basilar membrane in greater magnifica- 

 tion. (Alter Rasmussen, from Fulton/''). 



to stimulation of the sense cell. The sense cells are supplied with dendrites 

 ol ganglion cells of the auditory branch of the eighth cranial nerve, whose 

 cell bodies arc contained in a sj^iral ganglion located in the modiolus. 



