Risus sardonicus
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Risus sardonicus or rictus grin is a highly characteristic, abnormal, sustained spasm of the facial muscles that appears to produce grinning. Risus sardonicus may be caused by tetanus, strychnine poisoning or Wilson's disease.
The name of the condition, which has its roots in the Mediterranean island of Sardinia, derives from the appearance of raised eyebrows and an open "grin" – which can appear sardonic or malevolent to the lay observer – displayed by those experiencing these muscle spasms.
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See also
- Sardonicism
- Trismus
- Mr. Sardonicus
- The Man Who Laughs (1928 film)
- Twelve Dreams of Dr. Sardonicus, a 1970 music album by Spirit
- Joker (character)
- Smile (2022 film)
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