Risus sardonicus

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Science and technology

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What Wikipedia says

Risus sardonicus or rictus grin is a highly characteristic, abnormal, sustained spasm of the facial muscles that appears to produce grinning. It may be caused by tetanus, strychnine poisoning, or Wilson's disease, and has been reported after execution by hanging.

Excerpt from the Wikipedia article “Risus sardonicus”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Photo Credit: Content Providers(s): CDC/Dr. Thomas F. Sellers/Emory University, Public domain, via Wikimedia Commons.