During which phase of a tonic-clonic seizure do jerking movements occur?

In a tonic-clonic seizure, the clonic phase is characterized by rhythmic jerking movements. This phase follows the tonic phase, where there is a sudden stiffening of the muscles, leading to loss of consciousness and falling. Once the tonic phase ends, the clonic phase begins, during which the individual will experience repeated contractions and relaxations of the muscles. These jerking movements can affect all four limbs and may also involve facial muscles, often creating a very noticeable shaking pattern.

Understanding these two phases helps illustrate the progression of the seizure: the tonic phase sets the stage with muscle stiffness, while the clonic phase is where the observable jerking occurs. Recognizing the distinction between these two phases is essential in managing and responding to seizures effectively.