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  2. Myoclonus - Wikipedia

    en.wikipedia.org/wiki/Myoclonus

    The sudden jerks and twitching of the body can often be so severe that it can cause a small child to fall. A myoclonic seizure (myo "muscle", clonic "jerk") is a sudden involuntary contraction of muscle groups. The muscle jerks consist of symmetric, mostly generalized jerks, localized in the arms and in the shoulders and also simultaneously ...

  3. Rhythmic movement disorder - Wikipedia

    en.wikipedia.org/wiki/Rhythmic_movement_disorder

    body rocking, where the whole body is moved while on the hands and knees. head banging, where the head is forcibly moved in a back and forth direction. head rolling, where the head is moved laterally while in a supine position. Other less common muscle movements include: body rolling, where the whole body is moved laterally while in a supine ...

  4. Hypnic jerk - Wikipedia

    en.wikipedia.org/wiki/Hypnic_jerk

    A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch, myoclonic jerk, or night start is a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment.

  5. Dyskinesia - Wikipedia

    en.wikipedia.org/wiki/Dyskinesia

    Dyskinesia can be anything from a slight tremor of the hands to an uncontrollable movement of the upper body or lower extremities. Discoordination can also occur internally especially with the respiratory muscles and it often goes unrecognized. [3] Dyskinesia is a symptom of several medical disorders that are distinguished by their underlying ...

  6. Startle response - Wikipedia

    en.wikipedia.org/wiki/Startle_response

    Third, a synapse occurs from the PnC axons to the motor neurons in the facial motor nucleus or the spinal cord that will directly or indirectly control the movement of muscles. The activation of the facial motor nucleus causes a jerk of the head while an activation in the spinal cord causes the whole body to startle. [6]

  7. Dystonia is a disorder that causes repetitive involuntary ...

    www.aol.com/news/dystonia-disorder-causes...

    Dystonia is a disorder of involuntary muscle contractions that may cause repetitive and/or abnormal movement or postures. Dystonia is a disorder that causes repetitive involuntary muscle movements ...

  8. What is spasmodic dysphonia, the condition that impacts RFK ...

    www.aol.com/spasmodic-dysphonia-condition...

    The rare condition causes uncontrolled spasms in the muscles responsible for coordinating the vocal folds in the larynx, says Dysphonia International. These involuntary muscle movements can cause ...

  9. Motor disorder - Wikipedia

    en.wikipedia.org/wiki/Motor_disorder

    These disorders can cause lack of intended movement or an excess of involuntary movement. [4] Symptoms of motor disorders include tremors, jerks, twitches, spasms, contractions, or gait problems. [citation needed] Tremor is the uncontrollable shaking of an arm or a leg. Twitches or jerks of body parts may occur due to a startling sound or ...

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