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The muscles that drive the lower jaw (anterior group)
05-09-2009
Digastric (m.digastricus). Anterior belly (venter anterior) starts from the digastric fossa of the lower jaw, back (venter posterior) - from the mastoid notch of temporal bone. Intermediate tendon, the total for the front and rear of the abdomen, a large horn attached to the hyoid bone. From the lower jaw muscle bundles of the anterior abdominal directed downward and backward. When fixing the hyoid bone anterior belly of the lower jaw drops and displaces it backward.
Mandibulohyoid muscle (m.mylohyoideus) begins on the inner surface of the mandible in linea mylohyoidea. Muscle fibers run from top to bottom, inside, front to back to the midline, where they form tendon suture, which is transmitted from the inner surface of the chin to the body of the hyoid bone. With a fixed hyoid bone moves the lower jaw down and
posteriorly.
Mentohyoid muscle (m.geniohyo-ideus) starts from the inner chin spine. Hangs onto the body of the hyoid bone. From the lower jaw muscle bundles directed downward and backward. With a fixed hyoid bone down the lower jaw and several
it displaces posteriorly.
Genioglossal muscle (m.genioglossus) starts from the chin and spine, spray, is attached to the lingual fascia on the back of the tongue. The muscle pulls the tongue down and the front.
Lingual-hyoid muscle (m.hyoglossus), starting from the big horn and the body parts verhnebokovyh hyoid bone is directed forward and upward, and she weaves in the thick tongue, lingual fascia attaching to the edges of language and its back. The muscle pulls the tongue down and backwards.
The last two muscles, while reducing and strengthening of the hyoid bone displace the lower jaw posteriorly [SS Mikhailov, 1973]. Knowing the function of muscles and their attachment to the place of bone fragments, we can determine the nature of displacement of the latter. This makes it possible not only to recognize the change, but also to clarify the location of its slot.
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