Musculus mylohyoideus

The mylohyoid muscles form a paired muscular sling that forms part of the floor of the mouth. It also separates the sublingual space (and oral cavity) from the submandibular space.

Summary

  • origin: mylohyoid line/ridge on the medial surface of the mandible
  • insertion: midline raphe that extends from the mandibular symphysis to the hyoid bone

Arterial supply

Innervation

Action

  • elevates the floor of the mouth (e.g. in swallowing or protruding the tongue)

Variant anatomy

  • mylohyoid boutonniere: defect in the midportion of the mylohyoid muscle through which sublingual glands, blood vessels, fat, etc. can herniate