risus sardonicus


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Related to risus sardonicus: tetanus
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risus

 [ri´sus] (L.)
laughter.
risus sardo´nicus a grinning expression produced by spasm of the facial muscles; seen in tetanus and certain types of poisoning.

ri·sus ca·ni·nus

(rī'sŭs kā-nī'nŭs),
the semblance of a grin caused by facial spasm, seen especially in tetanus but also in some kinds of poisoning.
[L. risus, laugh + caninus, doglike]
A fixed ‘sarcastic’ grimace and anxious expression with drawing up of the eyebrows and corners of the mouth due to spasms of the masseter and other facial muscles, accompanied by rigidity of neck and trunk muscles and arching of back; the RS is seen in generalised tetanus, and caused by a neurotoxin produced by Clostridium tetani, a soil contaminant with a 7–10 day incubation
Prognosis Up to 90% mortality in the unvaccinated and/or susceptible population—e.g., narcotic addicts

risus sardonicus

A fixed 'sarcastic' grimace and anxious expression with drawing up of the eyebrows and corners of the mouth due to spasms of the masseter and other facial muscles, accompanied by rigidity of neck and trunk muscles and arching of back; the RS  is seen in generalized tetanus, and caused by a neurotoxin produced by.Clostridium tetani, a soil contaminant with a 7-10 day incubation Prognosis Up to 90% mortality in the unvaccinated/susceptible–eg, narcotic addicts

risus sardonicus

A characteristic facial expression, as of a sardonic grin, caused by spasm of the muscles of the forehead and the corners of the mouth in acute TETANUS.
References in periodicals archive ?
His only defense is the dying sneer of the damned, "the worst laugh I ever laughed," Adam's derisive curse in Expulsion, risus sardonicus.
Neuropsychiatric symptoms include parkinsonian-like tremor, rigidity, clumsiness of gait, slurred speech, drooling, and inappropriate and uncontrollable grinning (risus sardonicus).
At the same time, the animal's forehead will be wrinkled, and it will look "quite worried." The tail may be stiff and outstretched, the ears erect, and the lips pulled back, causing an expression that has been described as "risus sardonicus"--a sardonic smile.
On physical examination, he had trismus, risus sardonicus, muscular rigidity, and difficulty speaking.
He exhibited repetitive spasms of the facial muscles that produced a fixed grinning expression and elevated eyebrows (risus sardonicus).
They lack a sense of humor, except for the kind that goes with a risus sardonicus. They are raging appetites that want only what they want, which is power.
Perhaps Shakespeare's version of the Gothic romance's risus sardonicus in Macbeth says it most clearly: "There's daggers in men's smiles.
Her attending physician noted trismus and risus sardonicus. She reported that on about July 5 she had walked barefoot in her garden and incurred a puncture wound at the base of her right great toe; she cleaned the wound and removed a few small pieces of wood but did not seek medical attention.