View source for Medial pterygoid muscle

{{Muscle infobox |
  Name         = medial pterygoid |
  Latin        = musculus  pterygoideus medialis, musculus pterygoideus internus |
  GraySubject  = 109 |
  GrayPage     = 387 |
  Image        = Musculuspterygoideusmedialis.png | 
  Caption      = The Pterygoidei; the [[zygomatic arch]] and a portion of the [[ramus]] of the [[mandible]] have been removed. (Internus is visible at center bottom.) |
  Image2       = Gray783.png |
  Caption2     = The otic ganglion and its branches. (Pterygoideus internus labeled at bottom right.) |
  Origin       = ''deep head:'' medial side of [[lateral pterygoid plate]] behind the upper teeth<br>''superficial head:'' [[pyramidal process of palatine bone]] and [[maxillary tuberosity]] |
  Insertion    = medial [[angle of the mandible]] |
  Blood        = [[pterygoid branches of maxillary artery]] |
  Nerve        = [[mandibular nerve]] via [[nerve to medial pterygoid]] |
  Action       = [[Elevation (kinesiology)|elevates]] mandible, closes [[jaw]], helps [[Lateral pterygoid muscle|lateral pterygoids]] in moving the jaw from side to side |
  Antagonist   = |
  MeshName     = Pterygoid+Muscles |
  MeshNumber   = A02.633.567.600.700 |
  DorlandsPre  = m_22 |
  DorlandsSuf  = 12550302 |
}}
{{CMG}}
__NOTOC__


==Overview==

The '''medial pterygoid''' (or '''internal pterygoid muscle'''), is a thick, quadrilateral muscle of [[mastication]]. 

The mandibular branch of the fifth cranial nerve, the [[trigeminal nerve]], innervates the medial pterygoid muscle.

==Origin and insertion==
It consists of two heads. 
* The bulk of the muscle arises as a deep head from the medial surface of the [[lateral pterygoid plate]].  
* The smaller, superficial head originates from the [[maxilla|maxillary tuberosity]] and the pyramidal process of the [[palatine bone]].

Its fibers pass downward, lateral, and posterior, and are inserted, by a strong tendinous lamina, into the lower and back part of the medial surface of the [[ramus]] and angle of the [[mandible]], as high as the [[mandibular foramen]]. The insertion joins the [[masseter muscle]] to form a common tendinous sling which allows the medial pterygoid and masseter to be powerful elevators of the jaw.

As stated by one Dr. Anderson of UDMSD, the medial pterygoid goes from the canoe to the rough water. (The canoe is the depression created by the medial and lateral plates of pterygoid process, and rough water is the rough attachment surface on the medial aspect of the angle of the mandible.)

==Innervation==
Like the lateral pterygoid, and all other muscles of mastication, the medial pterygoid is innervated by the mandibular branch of the trigeminal nerve (V3).

==Actions==
It closes the jaw and help in mastication along with lateral pterygoid in side to side movement of jaw and protrusion.  It elevates the jaw, and in some aspect pulls it forward.

Also it elevates mandible.

==Additional images==
<gallery>
 Image:Gray169.png|Left palatine bone. Posterior aspect. Enlarged.
 Image:Gray177.png|Mandible. Inner surface. Side view.
 Image:Gray510.png|Plan of branches of internal maxillary artery.
 Image:Gray778.png|Distribution of the maxillary and mandibular nerves, and the submaxillary ganglion.
 Image:Gray782 updated.png|Mandibular division of trifacial nerve, seen from the middle line. 
 Image:Gray1031.png|Muscles of the pharynx, viewed from behind, together with the associated vessels and nerves. 
</gallery>

==External links==
* {{MuscleLoyola|mpte}}
* {{GPnotebook|-1483079600}}
* {{MedicalMnemonics|70|||}}
* {{RocheLexicon|25420.000-1}}

{{Gray's}}
{{Muscles of head}}

[[Category:Muscles of the head and neck]]

[[de:Musculus pterygoideus medialis]]
[[fr:Muscle ptérygoïdien médial]]
[[it:Muscolo pterigoideo interno]]
[[hu:Musculus pterygoideus medialis]]
[[ja:内側翼突筋]]
[[sr:Унутрашњи криласти мишић]]



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