perilymphatic duct

anatomy

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July 23, 2026

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The perilymphatic duct is a narrow channel that connects the interior of the cochlea to the subdural space in the posterior cranial fossa. This duct is located near the basal end of the scala tympani, which is one of the fluid-filled chambers within the cochlea. The perilymphatic duct allows perilymph, a fluid similar to cerebrospinal fluid, to flow between the cochlea and the cranial cavity. While it's anatomically possible for cerebrospinal fluid to enter the cochlea via this duct, studies suggest it's unlikely to be involved in the normal production of perilymph.12

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human ear
Structure of the cochlea
…aqueduct, through which passes the perilymphatic duct. This duct connects the interior of the cochlea with the subdural space in the posterior cranial fossa (the rear portion of the floor of the cranial cavity).
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…aqueduct, through which passes the perilymphatic duct. This duct connects the interior of the cochlea with the subdural space in the posterior cranial fossa (the rear portion of the floor of the cranial cavity).
Read More