has part has part has_part characteristic of has modifier abnormal stylohyoid muscle morphology absent stylohyoid muscle 2017-09-18T10:46:31Z MP:0030150 MPheno.ontology absence of the slender suprahyoid muscle lying anterior and superior of the posterior belly of the digastric muscle that elevates and retracts the hyoid bone, elongating the floor of the mouth during swallowing abnormal absent stylohyoid muscle