Orbicularis Oris
Posted On September 20 2018. Updated On September 20 2018.
The orbicularis oris muscle is the sphincter muscle around the mouth.
Risorius
Posted On September 20 2018. Updated On September 20 2018.
The risorius is a muscle of facial expression which arises in the fascia over the parotid gland and, passing horizontally forward, superficial to the platysma, inserts onto 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.