These cells amplify tiny movements of the basilar membrane of the cochlea; if the movement of this membrane is too harsh, its hair cells can die, leading to deafness.  
Overproduction of endolymph in this organ can lead to a condition know as Meniere's disease.  Here, shearing causes stereocilia to pivot at their base, which in turn causes the opening of ion channels and release of neurotransmitter.  A gelatinous, spiral shaped mass, its over twenty thousand outer hair cells are rooted in the tectorial membrane.  These cells amplify tiny movements of the basilar membrane of the cochlea; if the movement of this membrane is too harsh, its hair cells can die, leading to deafness.  FTP, name this organ of the inner ear where sound waves are transformed into nerve impulses.
Overproduction of endolymph in this organ can lead to a condition know as Meniere's disease.  
organ of Corti