inner ear morphology trait endolymphatic duct morphology trait ductus endolymphaticus morphology trait Trait.ontology Any measurable or observable characteristic related to the shape, structure, color or pattern of the small membranous canal, connecting with both saccule and utricle of the membranous labyrinth, passing through the aqueduct of vestibule, and terminating in the endolymphatic sac. VT:0006011