Abnormality of facial musculature Facial myokymia true true human_phenotype HP:0004651 Involuntary facial quivering MSH:D005155 Facial myokymia may be caused by a plaque of multiple sclerosis or have other causes. https://www.ncbi.nlm.nih.gov/pubmed/29961525 Facial myokymia is a fine fibrillary activity of one or more muscles innervated by the facial nerve (the seventh cranial nerve). UMLS:C0270871 Involuntary facial contraction SNOMEDCT_US:1070000 HP:0000317 Myokymia