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​Nasal Cavity

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Nasal cavity have a number of structures. The superior middle and inferior nasal conchae is this coronal section through the nasal cavity where that line down the middle is showing the nasal septum and then that's right down the middle and it separates our two parts of the nasal cavity.

Each nasal cavity has the following components a superior nasal conchae, middle nasal conchae and inferior nasal conchae called turbinate bones and they come out from the lateral nasal wall and underneath each of them they have these spaces called the superior meatus middle meatus and inferior meatus and these bring air into the nasal cavity. This air swirled and touches the mucosal lining the air is warmed up the air is filtered the airs add some humidity to it so doesn't dry out the nasal mucosa.

There's the medial wall of the nasal septum and there's the lateral wall of the nasal cavity and on the lateral wall is a superior nasal Concha a middle nasal Concha and an inferior nasal Concha. Just as we can see the coronal section now coming into the nasal cavity is cranial nerve and the olfactory nerve is for smell. And so there we've got these different branches coming to the nasal septum in the lateral nasal wall and in the sagittal section there we've got the olfactory bulb and tract and then they send there through the cribriform frame and of the ethmoid bone there we've got those olfactory nerves coming in.

The maxillary nerve does general sensation to the nasal cavity pain, temperature, touch, vibration and so forth and so there we've got cranial nerve each and it sends off branches that will go to the nasal septum branches that go to the lateral nasal wall and then even branches that go down to the hard palate to do general sensation which do the hard palate and part of the gums the buck so the lingual surface of the gums for general sensation alright now in this sagittal section here we see super middle and inferior nasal Concha. And then here we've got the opening for the sphenoid sinus and then here we have the opening for the maxillary sinus and you just need to know that a died rain those paranasal sinuses and then finally the nasolacrimal duct empties into the nasal cavity in the inferior meatus.

First here we've got the nasal cavity in the opening nasolacrimal duct so there's our lacrimal gland that under innervation of facial nerve. The greater petrosal branch causes you to cry number seven makes you cry close your eye innervates every gland in the head except when it goes through. Here's seven innervating the lacrimal gland tears then go down in the eye and they wash through the eye and and help keep the eye moist and then excess tears go into these canaliculi that drain into the lacrimal sac and drain down this nasolacrimal duct and end tear into the nasal cavity.

Hollow chamber within the frontal bone and then the ethmoid sinus also called ethmoid air cells because there's anterior middle and posterior to your chambers of these honeycomb looking sinusesin the ethmoid bone and then the maxillary sinus that flanks the nasal cavities below the orbit above the maxillary teeth and then the sphenoid sinus.

There is a key that shows a nasal cavity maxillary ethmoid frontal and sphenoid sinuses. All right now the nasal cavity Musil pharynx has the opening of the auditory tube also known as your eustachian tube. In this sagittal section there's the opening of the fringotympanic tube or your auditory tube and it's called the fringotympanic tube. The nasal pharynx in this coronal section which then goes into this tube that goes into the middle ear hence it's also called the auditory tube because it goes from the nasal pharynx into the middle ear where auditory area occurs and the new station and then eustachian tube for the scientists who discovered.

Nasal Cavity

Michelle Allan

Nasal Cavity

Earth's Lab