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Related to fenestra rotunda: cochlear window
an opening on the medial wall of the middle ear leading into the cochlea, closed in life by the secondary tympanic membrane.
fenestra(fe-nes'tra) plural.fenestrae [L., window]
1. An aperture frequently closed by a membrane.
2. An open area, as in the blade of an obstetrical forceps. fenestral (-tral), adjective
fenestra cochleaeRound window.