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The geniohyoid (Latin: musculus geniohyoideus) is a paired short and slender neck muscle located above the hyoid bone. Therefore, the geniohyoid is classified as the suprahyoid muscle. It stretches between the mandible and hyoid bone. Together with the mylohyoid muscle, the geniohyoid forms the floor of the mouth.
|Origin||Mental spine of mandible|
|Insertion||Body of hyoid bone|
|Action||Elevates hyoid bone and draws it forward, depresses mandible, widens pharynx|
|Innervation||Anterior ramus of spinal nerve C1 (via hypoglossal nerve (CN XII))|
|Blood supply||Sublingual artery|
The geniohyoid muscle originates from the inferior mental spine (genial tubercle) of the mandible.
The geniohyoid inserts on the superior border of the body of the hyoid bone.
The geniohyoid muscle depresses the mandible, elevates the hyoid bone and draws it forward. Also, it widens the pharynx.
The geniohyoid muscle receives arterial blood supply from the sublingual artery, which is a branch of the lingual artery.