hi let's talk about the osteology of the face
so starting superiorly with the bone that forms the front of the neurocranium we have
the frontal bone so i can outline what we can see of the frontal bone here just a very rough
outlining of it the uh the frontal bone has a a couple of features that uh we'll want to know
about for this session um and lucky for you that variation is expressed there as the super orbital
foramen or the supraorbital notch so v1 or the ophthalmic division of the trigeminal nerve comes
across the the roof of the orbit and one of its major branches is the frontal nerve that frontal
ramifies into the supratrochlear which is the medial nerve and the supra orbital which is the
lateral nerve nerve and that supraorbital nerve either exits out of the supraorbital foramen or
comes out under the supraorbital notch to serve the the median brow like so
so moving right along let's take a look at the uh the next uh bone of the face that we
care a lot about the maxilla so i'll just kind of very roughly outline that for us
oops like so um the maxilla is the upper tooth bearing bone of the skull and like
its counterpart the mandible
there is also an alveolar process of the maxilla and that would be the thickened area that is
adjacent to all of the uh the sockets of the teeth that's the the thickening of the the maxilla that
supports the teeth we also have uh infraorbital foramen so like the supraorbital foramen
these are almost in line with those those are for the infraorbital nerves branches
of v2 or the mandibular division most of the rest of v2 is quite uh secreted away in the deep face
next up we have the zygomatic bone also known as the zygoma
these are your cheek bones here
your zygomatic bones are good attachment sites for a lot of the uh the smiley uh muscles of uh
facial expressions are the ones that are affecting the the movement of the uh the upper lip or the um
superior lateral movement of the uh the angle of the mouth but we also have some zygomatico facial
foramen these zygomatico acial uh foramen um are holes through which the zygomaticofacial nerves
are transmitted zygomatico - my dog is rolling around there - the the zygomaticofacial
nerves are sensory branches of v2 in fact all of v2 is uh sensory as is all of
v1 and these branches come through to innervate the skin of the the malar region of the skull
we also have nasal bones here forming the bridge of the nose
outlining those there
and then finally the the mandible the the only intentionally kinetic bone of the skull so um
we'll hear a lot about the mandible when we discuss mastication and the muscles of mastication
but for now since we're relegating ourselves to this session we'll talk about the body of
the mandible so the body of the mandible meets the ramus of the mandible at the angle of the mandible
so all of this is body all of that is ramus and the body is supporting alveolar processes
and those alveolar processes of the mandible and the alveolar processes of the maxilla are
going to be important for this particular session because the buccinator muscle attaches to them
we also have the base of the mandible which is this
margin here along the bottom of the body the mental protuberance
mental comes from momentum latin for chin so the shape of the bone here determines the shape of the
chin it provides the underlying architecture and then it's kind of hard to see here let me
erase this there's also an oblique line of the mandible and the oblique line of the mandible
runs along there and it's providing um an attachment surface for the depressor
anguli oris depressor labia inferioris and portions of the platysma muscle as well
so we've talked a little bit about some of the the major players in terms of the osteological
architecture for the face things like the frontal bone and the maxilla the nasal bone
the zygomatic bone and finally the mandible thank you for your time