cochlear aqueduct cochlear aqueduct medial to the opening for the carotid canal and close to its posterior border, in front of the jugular fossa, is a triangular depression; at the apex of this is a small opening, the aquaeductus cochleae (or cochlear aqueduct, or aqueduct of cochlea), which lodges a tubular prolongation of the dura mater establishing a communication between the perilymphatic space and the subarachnoid space, and transmits a vein from the cochlea to join the internal jugular vein. aqueduct of cochlealeft temporal bone. inferior surface. (aquæductus cochleæ labeled at left, fifth from the top.)detailsidentifierslatinaquaeductus cochleaemeshd003052ta98a15.3.03.058ta2679fma77822anatomical terms of bone additional images base of skull. inferior surface.