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Now, we are going to do some revisions and then we'll go into the details of the "submandibular
region". Of course, these are the two lips, this is the buccinator muscle, this is the
masseter. At, the anteroinferior angle of the masseter, we have the facial artery and
the facial vein, and this is the temporal fascia, covering the temporalis muscle, "this
is the temporalis muscle, covered by the temporal fascia". Also, here is the sternomastoid.
So, "the two lips, the buccinator, the masseter, the temporal fascia and the temporalis, the
sternomastoid muscle, and of course this is the parotid gland , just below the auricle".
Masseter and sternomastoid and between them, there is the partoid gland. To, the lower
border of the mandible, the platysma is attached, and when I reflect the platysma this way,
there will be the submandibular gland. When, I remove the submandinular gland, there will
be the hyoid bone, and attached to the hyoid bone are the two superficial infrahyoid muscles.
The, sternohyoid medially and the superior belly omohyoid. Coming, from the mandible
to the hyoid bone, there is the mylohyoid muscle, on which the submandibular gland lays.
So again, if I remove the platysma, then I'll find the submandibular gland and deep to the
submandibular gland, there is the mylohyoid muscle, which comes from the mandible to the
mylohyoid bone. This is the site of the hyoid bone. And also, to the hyoid bone, the two
superficial infrahyoid muscles are attached (the sternohyoid and the omohyoid). So, this
is mylohyoid, the sternohyoid and this is the superior belly of omohyoid. If, I remove
the mylohyoid muscle (if I cut it from the mandible and take it down like this!), then
I'll find
the geniohyoid muscle, and above it there is the genioglossus muscle. So, this is the
geniohyoid muscle and when I reflect it, (this is the sublingual gland, lying on the genioglossus).
And, of course this muscle that comes from the mylohyoid bone up to the tongue, is the
hyoglossus muscle. So again !, this is the hyoid bone, this is the geniohyoid muscle,
this is the genioglossus muscle. And, from the hyoid bone to the tongue, (this is the
hyoglossus muscle). This, is the common carotid artery, that is divided above into external
and internal (external carotid and internal carotid). And, the two carotid arteries are
crossed by the hypoglossal nerve, which crosses also the hypoglossus and goes forward to terminate
into the genioglossus