- extremetonus;muscularrigidity;acommonsymptomincatatonicschizophrenia.Muscletonusis,inasense,thebeginningofbehavior.(physiology)oforrelatingtoorproducingnormaltoneortonusinmusclesortissue.Long-termatropinetreatmentofschoolmyopiacaneliminateaccommodati...
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