Vestibular Aqueduct

A narrow bony canal (aqueduct) that runs through the skull, connecting the inner ear (vestibule) to the cranial cavity—hence its name. Running through this bony canal is a membranous tube called the endolymphatic duct which connects the endolymphatic sac (located between the skull and the brain) and the inner ear. It is filled with endolymphatic fluid (endolymph).