00:01
The area just inside the nostril
that leads into the nasal cavity.
00:06
This area is called the nasal vestibule.
00:09
It's supported by the cartilage of the nose,
and it's lined with tissue that
contains small coarse hairs.
00:16
These hairs help to filter
dust, sand and other particles
that keep them from entering more
deeply into the respiratory passageways
depicting the nasal vestibule and the nasal cavity.
00:29
The nasal vestibule is shown right in through here,
and then the nasal cavity is this larger area
that we see posterior to the nasal vestibule
as well as superior.
00:40
We have a hash green line right in through here.
00:43
And this is the Liman nasi.
00:45
The Limen nasi is the boundary line between the bony
and the cartilaginous portion of the nasal cavity.
00:54
The nasal cavity proper and the
vestibule meet right at the limen nasi
so again the vestibule is here and then the
nasal cavity lies above and then posterior.
01:05
Lastly, the limen nasi marks
the transition of epithelial types.
01:11
Specifically we have a transition from
squamous epithelium to respiratory epithelium.
01:18
The nasal septum again will divide the nasal cavity
into a right nasal cavity and a left nasal cavity.
01:24
So this midline structure unless it's
deviated, is shown in through here
has a cartilaginous portion
and it has a skeletal portion.
01:35
The skeletal portion of the nasal
septum is in this superior view
is the perpendicular plate of the ethmoid bone.
01:45
This bony contribution to
the nasal septum is the vomer.
01:52
And then we have the septal cartilage,
forming the anterior portion of the nasal septum.
01:59
Here we're looking at the
lateral wall of the nasal cavity
in the structures that form the
right lateral wall that we're looking at.
02:07
will be duplicated on
the left lateral wall as well.
02:11
First contribution to the lateral wall is the
maxillary bone that we see in through here.
02:18
And then here we have the superior nasal
concha associated with the ethmoid bone.
02:25
This projection is the middle nasal concha.
02:27
It's also an osteologic feature of the ethmoid bone
and then existing as its own bone
is the inferior concha, nasal concha.
02:38
And then lastly we have the
palatine bone forming the lateral wall
of this specific part of the
palatine is the perpendicular plate.
02:47
But this extension vertically of the
palatine is the perpendicular plate
of the palatine bone forming the lateral wall.
02:59
Next to the nasal cavity is limited
superiorly by a roof in the structures that
contribute to the roof or the frontal dome.
03:10
This is more superior aspect of
the frontal bone with the frontal sinus.
03:14
We also have a contribution
from the nasal bone to the roof.
03:24
And the cribriform plate of the
ethmoid contributes to the roof as well.
03:33
This is looking at the floor of the nasal cavity.
03:39
And so here we have the palatine process
of the maxilla helping to form the floor.
03:45
This is also forming the hard palate anteriorly,
horizontal plate of the palatine bone
forming the posterior aspect of your hard palate
as well as the floor.
04:02
And then we have on both sides here associated
with the palatine processes are the maxillary bone.
04:09
We have a little opening
here called the incisive canal
and this is a passageway
for the nasal palatine nerve
and it also serves as a point of
connection called an anastomosis
between the greater palatine
and the spenopalatine arteries.