Anatomy of the “Muscles attached to the Mandible” by professor\ Ahmed Gunied. This, video discusses the muscles “taking origins” and the muscles inserted …
Now when we go to the inside of the symphysis
menti we'll find two lines two tubercles,
two tubercles above and two tubercles more
or less close to each other below. these are
called the superior genial tubercle which
give origin to the genioglossus. And the two
below which are close to each other are small,
which give origin to the geniohyoid. So superior
genial tubercle, inferior genial tubercle,
this is for the genioglossus and that is for
the geniohyoid and when we go more down we'll
find a fossa which is a digastric fossa which
gives origin to the anterior belly of digastric.
In another mandible these are the two superior
genial tubercle for the genioglossus and these
are the two inferior genial tubercles for
the geniohyoid origin and of course this is
the digastric fossa that gives origin to the
anterior belly of digastric. Again in this
mandible this is the fossa for the sublingual
gland and this is the fossa for the submandibular
gland. Now to summarize the structures attached
to the mandible, we have four insertions which
are the insertions of the muscles of mastication.
Of course this is the first insertion into
the coronoid process, this is the insertion
of the temporalis muscle. At the lateral surface
of the ramus this insertion is the insertion
of the masseter. To the pterygoid fovea which
is the front of the neck, this will be the
insertion of the lateral pterygoid. To the
inside of the angle this rough region this
will be the insertion will be the insertion
of the medial pterygoid. Therefore, the four
insertions will be the masseter into the ramus
and at the medial side of the angle there
will be the medial pterygoid. The temporalis
in the coronoid process and to front of the
neck in the pterygoid fovea there the lateral
pterygoid insertion. Now when we come to the
origins, the main origin will have four main
origins in addition to those attached to the
genial tubercle. In the upper border of the
oblique line opposite to the three molar teeth,
this is the origin of the buccinator, the
lower fibres of buccinator of course the upper
fibres arises from alveolar margin of maxilla.
From the lower margin of the mandible, there
will be the origin of platysma. So buccinator
and opposite to it all of the lower margin
giving origin to the platysma. From the digastric
fossa arises the anterior belly of digasteric
and from the mylohyoid line arises the buccinator,
of course the posterior end also gives origin
to the superior constrictor. So we have four
insertions, four origins, four main insertions
which are temporalis, masseter, lateral pterygoid
and medial pterygoid. The four main origins
buccinator, platysma which can be considered
also as an insertion because when the platysma
contracts, it takes the mandible down. Mylohyoid
and anterior belly of digastric when we want
to add to the origins of course the posterior
end of the mylohyoid gives origin to the superior
constrictor and as we agreed the genial tubercles
, the superior gives origin to the genioglossusand
the inferior gives origin to the geniohyoid

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