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musculus risorius (medicine)


musculus risorius -->
risorius
<anatomy, muscle> Origin, from platysma and fascia of masseter; insertion, orbicularis oris and skin at corner of mouth; action, draws angle of mouth laterally, lenghthening rima oris; nerve supply, facial.

Synonym: musculus risorius, Albinus' muscle, Santorini's muscle.

Origin: L. Risor, a laughter, fr. Rideo, pp. Risus, to laugh