Risorius
L. risus—laughter
origin: fascia over the cheek
insertion: skin at corner of mouth
action: pulls corner of mouth laterally causing dimples
insertion: skin at corner of mouth
action: pulls corner of mouth laterally causing dimples
Triangularis (Depressor anguli oris)
Of triangular shape
origin: lower margin of the mandible
insertion: skin at corner of mouth
action: pulls corner of mouth down; pulls upper lip down
Quadratus labii inferioris (Depressor labii inferioris)
L. quadratus—square-shaped + labii—of lip
Incorrect location of risorius
ReplyDeleteThis comment has been removed by the author.
DeleteFixed! Thanks for the heads up.
ReplyDelete