otocyst: The cavity, or cyst, which contains the essential parts of an organ of hearing.
Neither of these pairs of nerves seems connected with an otocyst.
The otocyst or auditory organ agrees in its main features with that of other vertebrates.
In Selachians the otocyst remains in the adult open to the exterior by the ductus endolymphaticus.
In various Teleosts the swimbladder enters into intimate relations with the otocyst.
Otolith: a little ear-bone: granules or concretions found in an otocyst.
otocyst o·to·cyst (ō'tə-sĭst')
The structure formed by invagination of the embryonic ectodermal tissue that develops into the inner ear.