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What seperates the nares?
Median septal cartilage
What does the medial septal cartilage of the nose articulate with?
- Anteriorly: Maxillae
- Posteriorly: Vomer and perpendicular plate of the ethmoid
What cartilages define the nostril shape?
What cartilages are found on the side of the nose?
Paired lateral nasal cartilages
What 3 bones make up the immovable skeleton of the nose?
- Nasal bones
- Basal part of frontal bones
- Frontal processes of the maxillae
Where does the nasal cavity begin and end?
- Begins: Nostril
- Ends: Choana
What does the choana open to?
What part of the nasal cavity is lined with skin and has hair?
What is the atrium covered by?
Respiratory nasal mucosa
What is the division of the mucosa of the nasal cavity?
- Posterior 1/3: Olfactory
- Inferior 2/3: Respiratory Area
What is the floor, medial wall and lateral wall of the nasal cavity formed by?
- Floor: Palatine bones and palatine processes of the maxilla
- Medial Wall: Septal cartilage, vomer and plate of the ehtmoid
- Lateral Wall: Conchae
What are the superior, middle and inferior concha made of?
- Superior and Inferior: Ehtmoid bone
- Inferior: Seperate bone, largest
What is the role of the conchae?
Increase surface area and allow air to be warmed and humidified
What are the passageways between the concha called?
- Superior meatus
- Middle meatus
- Inferior meatus
What is the space posterosuperiorly to the superior concha called and what is its role?
- Sphenoethmoidal recess
- Role: Communicates with the sphenoid sinus
What does the superir meatus communicate with?
Posterior ethmoidal sinus
What does the middle meatus communicate with?
- Frontal sinus
- Anterior ethmoidal sinus
- Middle ethmoidal sinus
- Maxillary sinus
What is special about the middle meatus and its structure?
- Contains a hiatus semilunaris
- Between ethmoid bulla and uncinate process
What does the inferior meatus communicate with?
The orbit through the nasolacrimal duct
What are the paranasal sinuses?
- Frontal sinuses: May be single or multiple
- Ethmoid sinuses
- Sphenoid sinuses
- Maxillary sinuses
What does the roof of the maxillary sinus form?
Floor of the orbit
How does the frontal sinus drain into the nasal cavity?
Via the infundibulum of the middle meatus via frontonasal ducts
What do the nasal branches of the anterior ethmoidal artery supply?
- Mucosa of the nose
- Anterior regions of the lateral walls
- Nasal septum
How does the greater palatine artery enter the nasal cavity?
What is the major blood supply to the posterior regions of the lateral walls and nasal septum?
How does the sphenopalatine artery enter the nasal cavity?
What supplies the posterior protions of the nasal cavity?
Posterior eithmoidal arteries
What innervates the respiratory area and through what type of fibers?
GSA from V1 and V2
What supplies the innervation to the nasal septum and how do they travel?
- Nasopalatine (V2)
- Travels with sphenopalatine arteries
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