hello anatomy friends this is dr alsup and this is the first in our laboratory specific videos for
the musculoskeletal portion of our course and i have these divided into separate stations as if we
were kind of sitting at a station in a laboratory trying to see the structures that we need to focus
on and then we'll move to the next station you may see some of these structures overlapping
and that makes sense because we're going to be focusing on different views so be aware that
that that may pop up okay so let us start with the anterior cranium and really it could be anterior
skull even though we are not going to focus on the mandible in this particular discussion so
we are looking at an anterior review and there's a few reasons why we know that we're looking at
anterior view and really this should say skull right here because we do have the mandible
but as you can see that's not what we're focusing on here so we know we're looking at anterior view
because you can see the larger portions of the orbital openings the teeth are kind of facing
us and as we know just by looking at ourselves or looking at our friends or family you can see
teeth are going to be more anteriorly placed so we're looking at a direct anterior view
and we're going to focus on a few things that we can see best from this view and these are
going to focus first on the frontal bone so the superior most bone up here that's going to extend
up into this region and this region around that coronal suture which isn't quite as visible right
here and we'll talk about the coronal suture in another video but i want to focus on this portion
at the top portion of the orbit and that is the supraorbital margins and the superorbital margins
if you recall from our discussion in the lecture videos is going to be the boundary between the
orbital part of the frontal bone so this would be that orbital part in here and the squamous part
or the forehead portion of the frontal bone so these margins right here you can palpate your own
super orbital margins and you will also have what's referred to as either a super orbital
notch or a superorbital foramen on this particular donor we have both a notch which you can see here
and a foramen you can have both foramina on both sides or both notches or one of each
there is a considerable amount of variation associated with that
and this is going to allow for the exit of supraorbital neurovasculature and
the supraorbital nerve is going to be a branch of v1 which is the first division
of the the trigeminal nerve so cranial nerve five in that first division of cranial nerve five
okay moving to the nasal septum right here what i'm outlining we are looking into
the nasal aperture and running right down the midline usually you have a slight deviation
but running pretty you know straight down the midline region is the bony nasal septum and this
septum nasal septum will divide the nasal cavity into right and left parts so right and left parts
and this is going to be made up of two bones the ethmoid
is going to be the more superior of the bones and the vomer will be the more inferior of the
bones and you can see kind of where they're articulating right about here during life
anteriorly there would be septal cartilage to kind of fill out the rest of this space
you can have a deviated septum where you can have either the vomer or the ethmoid or that
septal cartilage deviating to one side so away from the midline region this is often due to some
form of blunt force trauma sometimes it can be severe enough to actually have say a portion of
the ethmoid almost touching that lateral nasal wall and that can really obstruct breathing in
those certain cases and would need to be corrected surgically but for most deviated septums typically
it's just a little off midline and often does not require any type of surgical intervention
a few things you can see kind of on the side of the nasal aperture is going to be the conchae
concha or the turbinates the largest ones and the most inferior are as their names would
suggest the inferior nasal concha and these are going to be these scroll like structures there
they're going to be mucus membrane lines so they're offering surface areas or greater surface
areas for heat exchange humidification being able to move the hair air around once before it moves
into the rest of the respiratory system so the inferior nasal conchae as you can see on both sides
here are their own bones they are not of another bone you can see a bit of the middle nasal conchae
up here the middle and the superior which you can't see the superior at all in this view
would be part of the ethmoid bone so they are of the ethmoid bone whereas the inferior nasal
conchae are going to be their own separate bones all right excellent so you can see a lot of other
structures associated with the anterior cranium or skull for sure these are the structures we
wanted to focus on for this station and we will pick up with the cranium and skull
in our subsequent videos thank you for your time and attention and have a great day