Muscle tonus is, in a sense, the beginning of behavior.
extreme tonus; muscular rigidity; a common symptom in catatonic schizophrenia.
(physiology) of or relating to or producing normal tone or tonus in muscles or tissue.
It is the influence of muscle tonus upon bone formation that brings this aspect of morphogenesis back to an interaction with the central nervous system.
Long-term atropine treatment of school myopia can eliminate accommodation tonus, prevent or retard the progress of myopia.