risus sardonicus

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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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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]
Farlex Partner Medical Dictionary © Farlex 2012
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
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

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
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

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.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005