|Diagrammatic longitudinal section of the cochlea. (visible at far right under latin name ductus cochlearis)|
|Gray's||subject #232 1054|
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The cochlear duct (or scala media) is an endolymph filled cavity inside the cochlea, located in between the scala tympani and the scala vestibuli, separated by the basilar membrane and Reissner's membrane (the vestibular membrane) respectively.
Scala media houses the organ of Corti.
Additional images 
- cochlear+duct at eMedicine Dictionary
- Presentation at Virginia Commonwealth University
- Cross section at avatar.com.au