Medical term:

risorius



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

risorius

(rī-sŏ′rē-ŭs) [L., laughing]
The muscular fibrous band arising over the masseter muscle and inserted into the tissues at the corner of the mouth.
Medical Dictionary, © 2009 Farlex and Partners


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