The cochlear duct is part of the cochlea. It is separated from the tympanic duct (scala tympani) by the basilar membrane. It is separated from the vestibular duct (scala vestibuli) by the vestibular membrane (Reissner's membrane). The stria vascularis is located in the wall of the cochlear duct.
【Development】
The cochlear duct develops from the ventral otic vesicle (otocyst).It grows slightly flattened between the middle and outside of the body. This development may be regulated by the genes EYA1, SIX1, GATA3, and TBX1.The organ of Corti develops inside the cochlear duct.
【Function】
The cochlear duct contains the organ of Corti. This is attached to the basilar membrane. It also contains endolymph, which contains high concentrations of K+ for the function of inner hair cells and outer hair cells in the organ of Corti.