Nasal Cavity and Paranasal Sinuses Flashcards
What separates the right and left nasal cavity?
Nasal septum
What bones make up the anterior roof of the nasal cavity?
Nasal and frontal bones
What bones make up the central roof of the nasal cavity?
Cribriform plate of ethmoid bone
What bone makes up the posterior roof of the nasal cavity?
Sphenoid bone
What are the four paranasal sinuses?
- Ethmoidal air cells (many)
- Sphenoid (2)
- Maxillary (2)
- Frontal (2)
What lines the paranasal sinuses?
Respiratory mucosa
What nerve ultimately innervates all of the paranasal sinuses?
Trigeminal nerve
Where does the frontal sinus drain?
Frontonasal duct/canal -> infundibulum/semilunar hiatus -> middle meatus
What is special about the inferior concha?
It is an independent bone
What are the walls of the maxillary sinus?
Superior: between sinus and orbit
Medial: between sinus and nasal cavity
Lateral: between sinus and infratemporal fossa
Where is the opening of the maxillary sinus?
In the semilunar hiatus just inferior to the ethmoidal bulla
What sinus can be damaged during tooth extraction?
Maxillary sinus: can cause fistula
Where do the anterior ethmoidal air cells open into?
Semilunar hiatus
Where are the openings of the middle ethmoidal cells?
Ethmoidal bulla
What is the opening of the sphenoidal sinus called?
Sphenoethmoidal recess
