Clonus, a rhythmic movement of your foot and ankle, is an early symptom of neurologic conditions. If you have clonus during pregnancy, it usually means you have severe preeclampsia, a serious ...

People are cloned for organ harvesting in “Parts: The Clonus Horror,” a 1979 sci-fi and horror movie filmed in Simi Valley and nearby cities.

Medically reviewed by Brigid Dwyer, MD Clonus is an abnormal reflex response that produces involuntary, repetitive, and rhythmic muscle contractions when a muscle is stretched. This abnormal ...