membranous labyrinth morphology trait cochlear labyrinth morphology trait labyrinthus cochlearis morphology trait Any measurable or observable characteristic related to the shape, structure, color or pattern of the portion of the membranous labyrinth concerned with the sense of hearing (vs. the vestibular labyrinth, which is concerned with the sense of equilibration) and innervated by the cochlear nerve; it is located within the cochlea of the bony labyrinth, and consists of the cochlear duct, which contains the spiral organ. VT:0004426 organ of hearing morphology trait Trait.ontology