Perilymphatic duct

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The perilymphatic duct is a small epithelial-line channel that passes through the cochlear aqueduct in the bony labyrinth of the petrous temporal bone. It arises from the scala tympani of the cochlea and drains perilymph into the cerebrospinal fluid of the subarachnoid space of the posterior cranial fossa near the lateral aspect of the jugular foramen. It runs inferior and parallel to the internal auditory canal. It does not communicate with the endolymphatic duct.