"Synkinesia" translated into Russian means "continuous movement." However, this phenomenon in medicine takes on the meaning of an “unplanned” muscle contraction due to the impulse of the same muscle group involved in the previous movement. Synkinesia can manifest itself in ordinary situations; for most healthy people it does not pose any danger. But there is a certain category of patients in whom pathology of the function of these muscles or muscles innervated by a given nerve cell is detected.
Synkinesia can also be caused by certain drugs of certain groups. For example, fentanyl, when administered parenterally, directly innervates the bladder muscles. Insulin potentiates this effect. Synkinesis can occur with increased blood pressure. When blood pressure rises, so-called pseudodyskinesias appear - movements that are unusual for a given person. Both intramedullary (in the spinal cord) and extramedullary (outside the spinal cord) syndromes can be observed. In the latter case, the cerebellum or brain stem is affected. When the blood circulation in the brain is “blocked,” dysmetria and awkwardness of fine motor skills appear.