Main Model
Muscles : 35 Orbicularis oris
Muscle: Orbicularis oris (Oral
sphincter)
Origin: Medial maxilla and mandible; deep
surface of peri-oral skin; angle of
mouth (modiolus)
Insertion: Mucous membrane of lips
Main Action(s): Tonus closes oral fissure; phasic
contraction compresses and protrudes lips (kissing) or resists
distension (when blowing)