The cochlea is a shell-shaped spiral that turns between two-and-a-half and two-and-three-quarters times around the modiolus (a central column of porous bone).
The organ of Corti, a strip of sensory epithelium located in the scala media, lines the spiral of the cochlea.
The round window is an opening (covering by a membrane) in the middle ear that communicates with the cochlea and enables movement of cochlear lymph.
- cochlear aperture: opening of the distal internal acoustic canal that transmits the cochlear nerve
- with the vestibule posterosuperiorly