Geniohyoid muscle

Geniohyoid muscle

Infobox Muscle
Name = Geniohyoid muscle
Latin = musculus geniohyoideus
GraySubject = 112
GrayPage = 393


Caption = Anterior view. Geniohyoid muscle labeled at upper center left


Caption2 = Extrinsic muscles of the tongue. Left side.
Origin = Symphysis menti
Insertion = hyoid bone
Blood =
Nerve = C1 via hypoglossal nerve
Action = carry hyoid bone and the tongue upward during deglutition
DorlandsPre = m_22
DorlandsSuf = 12549193
The Geniohyoid muscle is a narrow muscle situated superior to the medial border of the mylohyoid muscle.

Origin and insertion

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.

Action

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.

Variations

It may be blended with the one on opposite side or double; slips to greater cornu of hyoid bone and Genioglossus occur.


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External links

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* [http://www.upstate.edu/cdb/grossanat/hnfrontal7-4.html Frontal section]


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