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Noun1.opisthotonos - severe spasm in which the back arches and the head bends back and heels flex toward the back
cramp, muscle spasm, spasm - a painful and involuntary muscular contraction


, opisthotonus
n. opistótonos, espasmo tetánico de los músculos de la espalda por el cual los talones se viran hacia atrás y el tronco se proyecta hacia adelante.
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A 168-kg crossbreed yearling steer originating from Mexico was found on a property in northern California in lateral recumbency, with opisthotonus and limbs in extensor rigidity.
A 2-year-old child with neuro-developmental delay presented acutely with convulsions and opisthotonus.