Upper covering layer of cochlear duct is
Reissner's membrane - between Scala vestibuli & Scala media. Basilar membrane - between scala media & Scala tympani Tectorial membrane - covers the hair cells. Stria vascularis gives the endolymph which is ultrafiltrate of blood.
Basilar membrane
Tectorial membrane
Stria vascularis
Vestibular membrane
JIPMER 2017