has part has part has_part characteristic of has modifier absent facial muscle abnormal zygomaticus muscle morphology absent zygomaticus muscle 2017-09-28T05:55:11Z MP:0030207 absence of the zygomaticus major and minor facial muscles that originate from the body of the zygoma and pass downwards to insert into the corner of the mouth and lateral aspect of the upper lip, respectively MPheno.ontology abnormal absent zygomaticus muscle