Risus sardonicus

Risus sardonicus or rictus grin is a highly characteristic, abnormal, sustained spasm of the facial muscles that appears to produce grinning.

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 suffering from these muscle spasms.

单词	Risus sardonicus
释义	Risus sardonicus 原声例句 Osmosis-微生物 Tetanus is characterized by powerful violent muscle spasms summed up by trismus, or lockjaw, Risus sardonicus, a persistent grin, and opisthotonos, a highly arched back with patient resting on his head and heels. 破伤风的典型表现为强有力的肌肉痉挛，记住典型三联：牙关紧闭、苦笑面容、角弓反张，即背部如弓样高耸，患者仅以头脚着地的体态。英语百科 Risus sardonicus Risus sardonicus or rictus grin is a highly characteristic, abnormal, sustained spasm of the facial muscles that appears to produce grinning. 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 suffering from these muscle spasms.
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