Mylohyoid muscle
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2008-06-26T08:46:42Z
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{{Infobox Muscle |
Name = {{PAGENAME}} |
Latin = musculus mylohyoideus |
GraySubject = 112 |
GrayPage = 393 |
Image = Mylohyoid muscle.PNG|
Caption = Muscles of the neck. Anterior view. Mylohyoid muscle in purple |
Image2 = Gray1195.png |
Caption2 = Front view of neck. (Mylohyoideus labeled at right, second from top.) |
Origin = [[Mylohyoid line]] ([[mandible]]) |
Insertion = [[Median raphé]] |
Blood = [[mylohyoid branch of inferior alveolar artery]] |
Nerve = [[mylohyoid nerve]], from [[inferior alveolar nerve|inferior alveolar branch of mandibular nerve [V3]]] |
Action = Raises [[oral cavity]] floor, [[elevates]] [[hyoid]], [[Depression (kinesiology)|depresses]] [[mandible]] |
MeshName = |
MeshNumber = |
DorlandsPre = m_22 |
DorlandsSuf = 12549818 |
}}
The '''mylohyoid muscle''' is a [[muscle]] running from the [[mandible]] to the [[hyoid bone]], forming the floor of the [[oral cavity]].
==Structure==
The mylohyoid muscle is flat and triangular, and is situated immediately above the anterior belly of the [[digastric muscle]]. It forms, with its fellow of the opposite side, a muscular floor for the cavity of the [[mouth]].
It arises from the whole length of the mylohyoid line of the [[mandible]], extending from the symphysis in front to the last [[molar (tooth)|molar]] tooth behind. The posterior fibers pass medialward and slightly downward, to be inserted into the body of the [[hyoid bone]]. It thus belongs to the [[suprahyoid muscles]].
The middle and anterior fibers are inserted into a median fibrous [[raphé]] extending from the [[symphysis menti]] to the [[hyoid bone]], where they joint at an angle with the fibers of the opposite muscle. This [[median raphé]] is sometimes absent; the fibers of the two muscles are then continuous.
==Innervation==
The mylohyoid muscle, along with the anterior belly of the [[digastric muscle]], is innervated by the [[mylohyoid nerve]], a nerve that ultimately arises from the mandibular division of the [[trigeminal nerve]].
==Variations==
It may be united to or replaced by the anterior belly of the [[digastric muscle]]; accessory slips to other hyoid muscles are frequent.
[[Image:Gray385.png|thumb|300px|Mylohyoid muscle visible right under jaw]]
==Additional images==
<gallery>
Image:Gray177.png|Mandible. Inner surface. Side view.
Image:Gray186.png|Hyoid bone. Anterior surface. Enlarged.
Image:Gray507.png|Superficial dissection of the right side of the neck, showing the carotid and subclavian arteries.
Image:Gray508.png|The arteries of the face and scalp.
Image:Gray778.png|Distribution of the maxillary and mandibular nerves, and the submaxillary ganglion.
Image:Gray994.png|Sagittal section of nose mouth, pharynx, and larynx.
Image:Musculi colli mylohyoideus.svg|Musculi colli mylohyoideus
</gallery>
==External links==
* {{MuscleLoyola|myl}}
* {{GPnotebook|-1456144304}}
* {{eMedicineDictionary|Mylohyoid+muscle}}
* {{RocheLexicon|25420.000-1}}
{{Gray's}}
{{muscle-stub}}
{{Muscles of neck}}
[[Category:Muscles of the head and neck]]
[[de:Musculus mylohyoideus]]
[[fr:Muscle mylo-hyoïdien]]
[[hr:Čeljusnopodjezični mišić]]
[[it:Muscolo miloioideo]]
[[ja:顎舌骨筋]]
[[sr:Милохиоидни мишић]]