Medical

risorius (muscle)

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ri·so·ri·us (mus·cle)

[TA]
facial muscle of mouth; 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(s): musculus risorius [TA], Albinus muscle (1) , Santorini muscle
Farlex Partner Medical Dictionary © Farlex 2012

ri·so·ri·us (mus·cle)

(ri-sōrē-ŭs mŭsĕl) [TA]
Facial muscle of mouth; 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.
[L. risor, one who laughs, fr. rideo, pp. risus, to laugh]
Medical Dictionary for the Dental Professions © Farlex 2012
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