hi let's talk about the innervation of the nasal cavity so what we'll see for the nasal cavity is
that the major sources of innovation are similar between the nasal septum and the lateral septal
wall and so we'll look at the innervation of the nasal septum first before moving on to
the lateral wall so with respect to the olfactory epithelium the olfactory nerves or cranial nerves
one descend down through the olfactory foramina of the cribriform plate and they are embedded
within the olfactory epithelium at the superior portion of the nasal cavity and we can see some
of these olfactory nerves here as indicated by the the circle that have been dissected out of
the mucosa there is also a medial nasal branch of the internal nasal branch of the anterior
ethmoid 'el nerve so recall the anterior ethmoid owner v' pierces through the medial wall of the
orbit and there is an internal nasal branch that has both a lateral and a medial nasal branch in
the medial nasal branch which is located here innovates the septum whereas the lateral nasal
branch innervates the lateral nasal wall so here we can see it would be cranial nerve one here we
can see branches of v1 or the ophthalmic division and the remainder of the the septum is going to
be innovated by branches of v2 probably the most reliable nerve that you're going to be able to
locate on the in the nasal cavity is going to be this one here the is the nasopalatine nerve
which is a branch of v2 nasopalatine nerve can be found in a groove of the vomer and it
is descending down along the foamer in an oblique fashion towards the the floor of the nasal cavity
in addition v2 also has an internal nasal branch of the infraorbital nerve and so we can see that
coming out here recall the infraorbital nerve of v2 is that terminal branch of v2 that exits
through the infraorbital foramen onto the mid-face and then a branch of that can enter into the nasal
cavity like so so we've got v1 and cranial nerves one at the top here and v2 on the bottom both the
anterior and the posterior aspects but IV too so now let's take a look at the lateral nasal wall
we can still see some of those olfactory nerves cranial nerves one there and we can see a couple
of branches of v1 so the the first that I would draw your attention to is this external nasal
nerve this is a branch of the anterior ethmoid allâh nerve so that's the external nasal nerve
it's called that because it can actually pierce through the nose to serve some of the the the
skin of the the superior portion of the nose there the other branch of v1 that we can see descending
down through here is that lateral nasal branch of the internal nasal branch of the anterior
ethmoid a nerve so recall the internal nasal branch has both medial and lateral branches
the medial branch is on the septum the lateral branch is on the lateral wall so 2v ones there
and then we have our our greatest hits of vitu let's start with the posterior superior lateral
nasal branch so that posterior superior lateral nasal branch is running along there so this is a
direct branch of v2 and this is going to serve both superior and middle nasal me at is's as
we move inferiorly we come along to a branch of the greater Palatine nerve which is a branch of
v2 called the posterior inferior nasal nerve so that would be there so if this is the posterior
superior lateral nasal branch this would be the posterior inferior nasal nerve and so being of
greater Palantine you know the posterior inferior nasal nerves aren't themselves direct branches of
v2 but greater Palantine is so we can see how the posterior aspect of the the lateral
wall is innervated by v2 but wait there's more piercing through the the the inferior meatus
there so that's that's the maxilla we have a branch of the anterior superior alveolar
nerve so the anterior superior alveolar nerves contribute to superior dental plexus and we have
a branch of this nerve that is poking through and serving the inferior nasal meatus so that
is another v2 branch and then finally we have yet another v2 branch here this is just another
internal nasal branch of the infraorbital nerve so wrapping around from the superficial mid-face
yet another v2 branch so as we can see on the lateral wall of the the nasal cavity we have the
same sort of pattern v1 branches and olfactory nerves are innervating superiorly v2 branch's
inferiorly and i guess we should say the v1 is just general sensory afferent whereas cranial
nerve one is special sensory v2 is general sensory afferent as well thank you very much for your time