Everything about Medial Pterygoid Muscle totally explained
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.
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.
Additional images
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.
Further Information
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