Hemifacial Spasm, also known as focal myoclonus of face, is related to vascular disease and hemifacial spasm, familial. An important gene associated with Hemifacial Spasm is MTHFR (Methylenetetrahydrofolate Reductase), and among its related pathways/superpathways are PI3K-Akt signaling pathway and Signaling by Receptor Tyrosine Kinases. The drugs Pharmaceutical Solutions and Acetylcholine have been mentioned in the context of this disorder. Affiliated tissues include eye and brain, and related phenotypes are liver/biliary system and reproductive system