[TA] 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. SYN: musculus mylohyoideus [TA], diaphragm of mouth, diaphragma oris, mylohyoideus.
