Medical Definition of Risorius
1.
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
(05 Mar 2000)
Lexicographical Neighbors of Risorius
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