Origin: Parotid fascia
Artery: Facial artery
Nerve: Buccal branch of the facial nerve
Action: Draw back angle of mouth
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.