The organ of Corti is a structure present in

1. external ear

2. middle ear

3. semi-circular canal

4. cochlea

 
(d) The organ of Corti is a structure present in cochlea. Cochlea bears the most important channel/canal called scala media, which has an upper membrane, the Reissner’s membrane and a lower membrane basilar membrane. Organ of corti are present on the sensory ridge of basilar membrane.