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RESEARCH.

DEPRESSOR LABII INFERIORIS.
 

                            The Depressor Labii Inferioris is the muscle that curls the lip downward.  This is only really included because it is a key muscle in the act of speaking.  There are two strands of the muscle, one on the left, one on the right, and each run from the lower lip down to the chin.  The two strands contract together and curl the entire lower lip straight down.
                            The lower lip forms a thick square with a well defined edge running along it's lower margin.  The depressor labii inferioris bares the teeth down to the gums, the chin may also wrinkle slightly.
 


Fig . 22  - The Depressor Labii Inferioris Muscle Fibers.