Conteùdo de sensagent
|Anterior view. Geniohyoid muscle labeled at upper center left|
|Extrinsic muscles of the tongue. Left side.|
|Gray's||subject #112 393|
|Nerve||C1 via the hypoglossal nerve (XII)|
|Actions||carry hyoid bone and the tongue upward during deglutition|
The Geniohyoid muscle is a narrow muscle situated superior to the medial border of the mylohyoid muscle. It is named for its passage from the chin ("genio-" is a standard prefix for "chin") to the hyoid bone.
It arises from the inferior mental spine, on the back of the symphysis menti, and runs backward and slightly downward, to be inserted into the anterior surface of the body of the hyoid bone; it lies in contact with its fellow of the opposite side. It thus belongs to the suprahyoid muscles. The nerve supply to geniohyoid is from C1 running with the hypoglossal nerve.
During the first act of deglutition, when the mass of food is being driven from the mouth into the pharynx, the hyoid bone, and with it the tongue, is carried upward and forward by the anterior bellies of the Digastrici, the Mylohyoidei, and Geniohyoidei. It also assists in depressing the mandible
It is innervated by fibers from C1 hitchhiking on Cranial Nerve XII.
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