All right, this presentation
is on the anatomy of the nose.
And here, we're going to
begin with the external nose
and we'll look at the relative regions
that contribute to the external nose.
The first area, is shown in through here
and over in through here,
in the view to the right.
This area represents the “Root” of the nose
and it's located between the eyebrows.
Just inferior to the root of the nose,
you have the "Bridge" of the nose,
it's better kind of seeing in through here.
You can see how the bridge is
depressed below the root of the nose
and then from here, the nose will slope,
have an inclination and the
sloping portion of the nose,
that we better see here in
the figure to the right,
is going to be the “Dorsum nasi.”
The lateral flares of the of the
nose are each one is an “Ala.”
And then on the inferior aspect,
if you travel down the dorsum nasi,
and come right in through here around the corner,
you have this inferior
projection of the external nose,
called the “Apex.”
And then inferior to the apex
associated with the upper lip,
is a continuation of the “Philtrum.”
The nose is made up of skeletal
features or structures,
as well as cartilaginous structures,
so, we'll take a look at the
Here we see a collection of
of the external nose.
We'll look at the bony framework around the nose,
superiorly here is the “Frontal bone.”
Here's the skeletal feature,
forming the external nose,
called the nasal bones paired.
We also have the “Maxillary
bone,” shown in through here
and also appearing in this view is,
one of the first cartilaginous
structures of the external nose,
it lies, just inferior to the nasal bones.
And this is the lateral process
of the septal nasal cartilage.
The lateral process of the septal nasal cartilage,
is triangular in shape, the upper part does fuse,
with the septal cartilage, that
we'll see in a subsequent slide.
But for now, the superior
margin of this cartilage,
shown along in through here,
is attached to the nasal bone
and then the frontal process,
of the maxillary bone, which is
right along and through here.
The inferior margin right along and through here,
is connected by fibrous tissue, to the
lateral crus of the major alar cartilage
and that is the major alar
cartilage, right in through here.
And then laterally it is attached indirectly
to the margins of the piriform aperture,
by loose fibro aurelia connective tissue
and this tissue may also contain one
or more small sesamoid cartilages
and we do have a sesamoid
cartilage, right in through here.
This slide is showing the major alar cartilage,
that was referenced, in the previous slide,
you see it again labeled right
in through there for you.
Medially the major alar cartilage attaches,
to the contralateral counterpart.
So, right and left right here in the midline,
and then to the antero inferior
part of the septal cartilage.
Laterally, it is connected to the
frontal process of the maxilla,
which will be right along in through here
and in addition to the lateral
crus of the major alar cartilage,
we also have the medial crus of the
alar cartilage, right into here.
This is showing the septal nasal cartilage.
You just see a little bit right in through here,
the next slide will show us,
the septal cartilage in this particular view.
It is quadrilateral in shape,
the antero superior margin is connected
above to the posterior border,
of the inner nasal suture,
so, the nasal bones are right in through here
and where those right left nasal
bones meet there's a suture
and that would be the anterior superior margin.
The anteroinferior portion
the cartilaginous septum,
is attached to the anterior nasal spine, which is,
a projection of the maxilla.
And then the postero superior border
joins the perpendicular plate,
of the ethmoid bone.
This would be the postero superior border
and this would be the perpendicular
plate of the ethmoid bone.
This particular view, shows the septal cartilage,
dividing the nasal apertures right and left.
Here's an internal view,
demonstrating the nasal cavities.
We start unlabeled, but let's
take a look at what we have here.
The nasal cavities are separated into
right and left ones, by the septum
and we see the nasal septum
highlighted right in through here.
This bony feature, is called the, “Middle concha,”
it is a part of the ethmoid bone.
So, it projects into the nasal cavity on
the right side as well as the left side.
We also have in this particular
view, another concha,
this is the “Inferior concha,”
these are paired as well,
these are individual bones.
And then, not a bony feature,
but if you look around,
on the lateral aspect of the inferior concha,
you have is known as a “Meatus.”
And since this meatus is associated
with the inferior concha,
it is called the, “Inferior meatus.”
And then outside of the nasal cavities,
but in communication with the
nasal cavities are, “Sinuses.”
And this particular sinus
is the, “Maxillary sinus”
and it is bilateral, so we see
the right one in the left one.
And more to come on drainage
into the nasal cavity,
a little bit later.