cochlea morphology trait cochlea basement membrane morphology trait Trait.ontology VT:0000779 Any measurable or observable characteristic related to the shape, structure, color or pattern of the continuous basement membrane found within the membranous labyrinth of the cochlea, known to extend from the limbus, down to the inner sulcus, across the basilar membrane, up to the external sulcus to the spiral prominence and radiating into the spiral ligament ensheathing the root cell processes.