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The inner ear corresponds to 2 distinct sensory organs: the balance organ or vestibule, and the hearing organ or cochlea, which have a similar embryological origin, the otic vesicle. Both organs also share morphological and physiological properties, such as hair cells and the transduction mechanism.
Vestibule and cochlea: two sensory organs of the inner ear
Two sensory organs are located in the inner ear. The vestibule is the organ of equilibrium and the cochlea the organ of hearing. They share a common embryonic origin (otic vesicle), plus different morphological or physiological properties such as endolymph, hair cells and mechano-transduction.
The schematic drawing below represents the osseous (top left) and membranous (seen by transparency in the main drawing) labyrinths.
1. Anterior semicircular canal