Anatom3DRisorius muscle
Musculus risorius · Smějící sval
Muscles
Looks like
A thin, variable strip of muscle in the cheek, running from the tissue over the jaw angle across to the corner of the mouth.
What it does
Pulls the corner of the mouth sideways, widening the mouth as in a grimace.
Keeping it well
Often small or absent; this is normal. Powered by the facial nerve.