has part has part has_part characteristic of part of has modifier abnormal eye muscle morphology abnormal eyelid muscle morphology abnormal orbicularis oculi muscle morphology 2017-09-22T10:12:14Z MPheno.ontology MP:0030173 abnormal orbicularis oculi morphology any structural anomaly of the ring-like (sphincter) facial muscle composed of skeletal muscle fibers and arranged in concentric bands around the upper and lower eyelids; its function is to close the eyelids, and to help in the passing and draining of tears through the punctum, canaliculi, and lacrimal sac, all parts of the tear drainage system morphology abnormal orbicularis oculi muscle