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Myoclonus is a brief, involuntary, irregular (lacking rhythm) twitching of a muscle, a joint, or a group of muscles, different from clonus, which is rhythmic or regular. Myoclonus (myo-"muscle", clonus "spasm") describes a medical sign and, generally, is not a diagnosis of a disease.
Palatal myoclonus. The myoclonic triangle (also known by its eponym Triangle of Guillain-Mollaret or dentato-rubro-olivary pathway) is an important feedback circuit of the brainstem and deep cerebellar nuclei which is responsible for modulating spinal cord motor activity. [1] [2] The circuit is thus composed: [2]
It is a disease that presents Myoclonus as a sequela of hypoxic disorders in the brain due to asphyxiation and cardiopulmonary arrest. [ 2 ] [ 3 ] It is exacerbated by mental and physical anxiety such as intention, intentional movement, and tension.
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Benign sleep myoclonus of infancy 781.01 R25.8 Hypnagogic foot tremor and alternating leg muscle activation during sleep 781.01 R25.8 Propriospinal myoclonus at sleep onset 781.01 R25.8 Excessive fragmentary myoclonus: 781.01 R25.8 Other Sleep Disorders: Other physiological (organic) sleep disorder 327.8 G47.8
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.
Palatal myoclonus is a rare condition in which there are rhythmic jerky movements or a rapid spasm of the palatal (roof of the mouth) muscles. Chronic clonus is often due to lesions of the central tegmental tract (which connects the red nucleus to the ipsilateral inferior olivary nucleus ).
Opsoclonus myoclonus syndrome (OMS), also known as opsoclonus-myoclonus-ataxia (OMA), is a rare neurological disorder of unknown cause which appears to be the result of an autoimmune process involving the nervous system. It is an extremely rare condition, affecting as few as 1 in 10,000,000 people per year.