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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.
According to a study on sleep disturbances in the Journal of Neural Transmission, a hypnic jerk occurs during the non-rapid eye movement sleep cycle and is an "abrupt muscle action flexing movement, generalized or partial and asymmetric, which may cause arousal, with an illusion of falling". [13]
Weakness/paralysis of a limb or the entire body (hysterical paralysis or motor conversion disorders) Impairment or loss of speech (hysterical aphonia) Difficulty swallowing or a sensation of a lump in the throat; Urinary retention; Psychogenic non-epileptic seizures or convulsions; Persistent dystonia; Tremor, myoclonus or other movement disorders
Sleep paralysis is a state, during waking up or falling asleep, in which a person is conscious but in a complete state of full-body paralysis. [1] [2] During an episode, the person may hallucinate (hear, feel, or see things that are not there), which often results in fear.
13. Sleeping Beside You. You can be sure your cat loves you if you frequently wake up to them sleeping curled at your feet - or on your chest! Sleep is a vulnerable time for cats, so if they like ...
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]
This theory is supported by the variability of clinical signs within affected cats, with many of the clinical signs being present within other feline disorders including dermatological, behavioural, orthopaedic and neurological disorders. Further support of this theory is provided by the mixed response to a wide range of therapeutic treatment.
Myoclonus is usually classified physiologically to optimize treatment. Myoclonus is a precursor effect to myoclonus dystonia and most commonly begins in childhood or adolescence. [4] [5] Myoclonus is classified as cortical, subcortical, peripheral or spinal. Cortical myoclonus is the most common of these four and affects the upper limbs and face.