Origin
Mandible
Insertion
Dermis of the chin.
Blood supply
Facial artery.
Nerve supply
Facial nerve.
Action
It helps in movement of the lower lip, thereby causing wrinkling of the chin.
Disease/Injury
Geniospasm is a rare genetic disorder affecting the mentalis muscle in which there is uncontrollable, involuntary shaking of the chin and lower lip.
Interesting facts
This muscle is used to express doubt.
