Nasal Cavity and Paranasal Sinuses Flashcards
External nares function
Connect nasal cavity to the environment
How is the nose supported?
- Nasal bones
- Fleshy cartilaginous network
What lines the vestibule of the nose?
Hairs called vibrissae
Anterior nasal cavity boundary
External nares
Posterior nasal cavity boundary
Internal nares
Superior nasal cavity boundary
- Cribriform plate of ethmoid
- Body of sphenoid
Inferior nasal cavity boundary
Superior aspect of the hard palate
Medial nasal cavity boundary
Midline nasal septum
Lateral nasal cavity boundary
Nail, maxilla, ethmoid, palatine, lacrimal, and conchae
What bones form the hard palate?
Maxilla and palatine
The nasal cavity is continuous with the…
Nasopharynx through the internal nares
Nasal septum divides…
The nasal cavity into left and right portions
What forms the nasal septum?
- Septal cartilage
- Vomer
- Perpendicular plate of ethmoid
Boney projections of the lateral nasal wall are called
Conchae
Conchae are covered by…
Highly vascularized mucosa
Conchae function
- Humidify air
- Warm air
What bone is the superior concha apart of?
Ethmoid
What are meatuses?
Spaces inferior and lateral to the conchae
What does the middle meatus have?
- Ethmoidal bull
- Hiatus semilunaris
Where is the spenoethmoidal recess located?
Above superior concha
Where are the ostia located? What are they?
- Nasal meatuses
- Openings for communication with paranasal sinuses
The middle meatus communicates with which paranasal sinuses?
Maxillary sinus, ethmoid sinus, and frontal nasal duct
Respiratory mucosa function
Warm and humidifies air
Olfactory mucosa function
Mediates sense of smell
What increases the surface area within the nasal cavity?
Concha
Do the concha and meatuses speeds up or slows down the flow of air?
Slows down
What does the olfactory mucosa contain?
Olfactory receptor neurons that mediate sense of smell
Where do bundles of olfactory receptor neuron axons pass through?
Cribiform plate of the ethmoid bone
What innervates the nasal cavity?
- CN I
- CN V1
- CN V2
What part of the nasal cavity does CN V1 innervate for general sensory?
Superior aspect
What part of the nasal cavity does CN V2 innervate for general sensory?
Inferior aspect
What nerve goes through the incisive canal?
Nasopalatine nerve
What does the nasopalatine innervate? Is it sensory or motor?
Sensory innervation of anterior part of hard palate, directly behind maxillary incisors and canines
What provides arterial supply to the nasal cavity?
- Ophthalmic artery
- Maxillary artery
- Facial artery
Where is there an anastomosis in the nasal region?
Between the nasopalatine and greater palatine arteries in the incisive canal
What does the sphenoethmoidal recess communicate with?
Sphenoid sinus
What does the superior meatus communicate with?
Posterior ethmoidal cells
What does the inferior meatus communicate with
Nasolacrimal canal
What does the middle meatus communicate with?
- Maxillary sinus
- Frontal sinus
- Ethmoid
Paranasal sinuses function
- Decrease weight of skill
- Warm and humidify air
- Serve as chambers for sound resonance
What bone Is the ethmoidal sinus in?
Ethmoid bone
What bone is the frontal sinus in?
Frontal bone
Where is the hiatus semilunaris located?
Middle nasal concha
What structure is the sphenoid sinus located near?
Pituitary gland
What is the largest paranasal sinus?
Maxillary sinus
What structure is the maxillary sinus near
Maxillary premolars and molars
Why is the maxillary sinus hard to drain?
Opening is located near the roof of the sinus
What structures communicate to the middle meatus through the hiatus semilunaris?
- Anterior ethmoid cells of ethmoidal sinus
- Maxillary sinus
- Frontonasal duct of frontal sinus
Sinusitis
Infection of sinuses
What roots project into the maxillary sinus?
Maxillary molars
What mediates sensation to the maxillary teeth?
CN V2
Where does CN V2 go through? Is it sensory or motor innervation?
- Maxillary sinus
- Sensory
