Anterior view. Geniohyoid muscle labeled at upper center left
Extrinsic muscles of the tongue. Left side.
|Inferior mental spine of Mandible|
|C1 via the hypoglossal nerve (XII)|
|Actions||carry hyoid bone and the tongue upward during deglutition|
|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") to the hyoid bone.
It arises from the inferior mental spine, on the back of the mandibular symphysis, and runs backward and slightly downward, to be inserted into the anterior surface of the body of the hyoid bone. :346 It lies in contact with its fellow of the opposite side. It thus belongs to the suprahyoid muscles.
The geniohyoid muscle brings the hyoid bone forward and upwards. This dilates the upper airway, assisting respiration. 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
- This article uses anatomical terminology; for an overview, see anatomical terminology.
- Singh, Inderbir (2009). Essentials of anatomy (2nd ed. ed.). New Delhi: Jaypee Bros. ISBN 978-81-8448-461-8.
- Takahashi, S. (1 December 2002). "Breathing modes, body positions, and suprahyoid muscle activity". Journal of Orthodontics 29 (4): 307–313. doi:10.1093/ortho/29.4.307.
- Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students (Pbk. ed.). Philadelphia: Elsevier/Churchill Livingstone. ISBN 978-0-443-06612-2.
- Barney, A.; Martelli, S.; Serrurier, A.; Steele, J. (21 November 2011). "Articulatory capacity of Neanderthals, a very recent and human-like fossil hominin". Philosophical Transactions of the Royal Society B: Biological Sciences 367 (1585): 88–102. doi:10.1098/rstb.2011.0259.
- Origin, insertion and nerve supply of the muscle at Loyola University Chicago Stritch School of Medicine
- -221249457 at GPnotebook
- Anatomy figure: 34:02-06 at Human Anatomy Online, SUNY Downstate Medical Center
- Geniohyoid+muscle at eMedicine Dictionary
- Anatomy diagram: 25420.000-1 at Roche Lexicon - illustrated navigator, Elsevier
- Frontal section