Geniohyoid muscle
Geniohyoid muscle | |
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Details | |
Origin | Symphysis menti |
Insertion | hyoid bone |
Nerve | C1 via the hypoglossal nerve (XII) |
Actions | carry hyoid bone and the tongue upward during deglutition |
Identifiers | |
Latin | musculus geniohyoideus |
TA98 | A04.2.03.007 |
TA2 | 2166 |
FMA | 46325 |
Anatomical terms of muscle |
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")[1] to the hyoid bone.
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. It also assists in depressing the mandible
Innervation
It is innervated by fibers from C1 hitchhiking on Cranial Nerve XII.
Variations
It may be blended with the one on opposite side or double; slips to greater cornu of hyoid bone and Genioglossus occur.
Additional images
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Hyoid bone. Anterior surface. Enlarged.
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Sagittal section of nose mouth, pharynx, and larynx.
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Geniohyoid muscle
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Geniohyoid muscle
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Geniohyoid muscle
References
External links
- Template:MuscleLoyola
- . GPnotebook https://www.gpnotebook.co.uk/simplepage.cfm?ID=-221249457.
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(help) - Anatomy figure: 34:02-06 at Human Anatomy Online, SUNY Downstate Medical Center
- Template:EMedicineDictionary
- Template:RocheLexicon
- Frontal section
This article incorporates text in the public domain from page 393 of the 20th edition of Gray's Anatomy (1918)