outer fluid filled channel of the cochlea which communicates with the middle ear through the round window

The outer fluid filled tunnel of the cochlea which communicates with the middle ear via the round window.

Fluid-filled region of the cochlea, nearest to round window.

tympanon = drum; the spiralling cochlear duct below spiral lamina, containing perilymph and ending at round window near tympanic membrane.

lower spiral-shaped channel of the bony cochlea, filled with perilymph

The lower chamber of the cochlea.

See tympanic duct.

Chamber within the the cochlear duct

Scala tympani is the name of one of the perilymph filled cavities in the cochlear labyrinth. It is separated from the scala media by the basilar membrane, and it extends from the round window to the helicotrema, where it continues as scala vestibuli.