abnormal cranial nerve morphology abnormal oculomotor nerve morphology MP:0001061 MPheno.ontology abnormal CN-III morphology any structural anomaly of the third 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 oculomotor nerve abnormalities oculomotor nerve dysplasia