Then in quick succession, we add the smiling muscles, levator anguli oris (attaching just below the eye to lift the corners of the mouth) and the sadness muscles, levator labii superioris (Fig 4) (which deepen the nasiolabial fold when crying or being serious) and the depressor anguli oris
, the disgust muscle (a triangular muscle attaching to the lower jaw at the side of the mouth) which lowers the corners of the mouth.
Specifically, the 'grief' muscles, the corrugator supercilli - located around the eyebrow - and depressor anguli oris
- between the chin and corner of the lips - were more often contracted in the faces of 'genuine' rather than 'deceptive pleaders,'" University of British Columbia researchers found.
the mandibular lamina (the depressor labii inferioris, the mentalis, the risorius, the depressor anguli oris
, the inferior part of the orbicularis oris, and perhaps the buccinator and the levator anguli otis)