cranial nerve morphology trait oculomotor nerve morphology trait VT:0001061 Trait.ontology CN-III morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern of the 3rd cranial nerve, which normally sends motor fibers to the levator muscles of the eyelid and to the superior rectus, inferior rectus, and inferior oblique muscles of the eye; and also sends parasympathetic efferents to the muscles controlling pupillary constriction and accommodation.