Risorius muscle
Musculus risorius
- Eponym: Muscle of Albinus; Santorini's muscle
- Related terms: Risorius
Definition
Origin: Parotid fascia
Insertion: Modiolus
Artery: Facial artery
Nerve: Buccal branch of the facial nerve
Action: Draw back angle of mouth
Description:
The Risorius arises in the fascia over the Masseter and, passing horizontally forward, superficial to the Platysma, is inserted into the skin at the angle of the mouth. It is a narrow bundle of fibers, broadest at its origin, but varies much in its size and form.