risorius

Meanings

1. 1
   noun

   A narrow band of facial muscle arising from the fascia over the masseter and inserting into the tissues at the corner of the mouth, which it draws laterally, as is used when smiling.

   The risorius draws the corner of the mouth laterally.

Borrowed from Late Latin rīsōrius (“ridiculous, laughing”), clipping of mūsculus rīsōrius (“laughing muscle”).

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