cranial ganglion morphology trait vestibular ganglion morphology trait vestibular ganglion of the vestibulocochlear (VIII) nerve morphology trait spiral ganglion morphology trait Scarpa ganglion morphology trait Trait.ontology VT:0002856 Any measurable or observable characteristic related to the shape, structure, color, or pattern of the group of neurons associated with the vestibular part of the eighth cranial nerve that are involved in equilibration. cranial ganglion VIII