Origin
From the zygomatic arch, platysma and the masseteric and parotid fascia.
Insertion
Into the modiolus at the angle of the mouth.
Blood supply
Facial artery, transverse facial artery.
Nerve supply
Facial nerve.
Action
This muscle helps in smiling. It also produces wrinkles at the outer corner of the eyes.
Disease/Injury
Bell’s palsy, i.e., facial nerve palsy, can affect the function of this muscle.
Muscle Exercise
Whistling, pronouncing vowels, chewing bubble gum, etc., help to strengthen this muscle.
Interesting facts
The expressions of smile and laughter are given with the help of the risorius muscle.
