The organ of corti is a structure present in
(a) external ear (b) middle ear
(c) semi-circular canal (d) cochlea
(d) The organ of Corti is a structure present in the cochlea. Cochlea bears the most important channel/canal scala media, which has an upper membrane, the Reissner's membrane and a lower membrane basilar membrane. Organ of Corti is present on the sensory ridge of the basilar membrane.