Muscle of floor of mouth;
origin, mylohyoid line of mandible;
insertion, upper border of hyoid bone and raphe separating muscle from its fellow;
action, elevates floor of mouth and the tongue, depresses jaw when hyoid is fixed;
nerve supply, nerve to mylohyoid from mandibular division of trigeminal.
Synonym(s):
diaphragm of mouth,
musculus hyoideus [TA] .