Anatomy - Nasal Cavities and Paranasal Sinuses Flashcards
What kind of cartilage is the cartilage in the nose? What are it’s properties?
Hyaline cartilage
Tough but pliable
Avascular - reliant on diffusion from skin overlying it
What should you not be used in the region of the nasal cartilages (including the nasal septum)?.
Adrenalin containing anaesthetic
What does a septal haematoma do?
Separates the septal cartilage from its nutrient source
What makes up the nasal septum?
Perpendicular plate of the ethmoid bone
vomer (posteriorly)
septal hyaline cartilage (anteriorly)
What makes up the roof of the nasal cavity?
nasal bones (anteriorly) cribriform plate of the ethmoid bone including the crista galli of the ethmoid (posteriorly)
What makes up the floor of the nasal cavity?
the hard palate
R & L Maxillae (anteriorly)
palatine bones (posteriorly)
What makes up the lateral wall of the nasal cavity?
Orbital plate of ethmoid
ethmoidal (air) cells
superior and middle conchae
What can Le Fort 2 and 3 fractures do?
Can disrupt the cribriform plate of the ethmoid bone resulting in danger of infection spreading drom the nasal cavity and paranasal sinuses into the anterior cranial fossa
Why does a septal haematoma need to be incised and drained?
To prevent AVN of the septal hyaline cartilage
Name the different kinds of mucosa lining the nasal cavities from nostril backwards.
Keratinise stratified squamous epitheium
respiratory epithelium
olfactory mucosa
Name the two parts of the Olfactory nerve?
Olfactory bulb --> Olfactory tract (ends in the temporal lobe)
What actually is the olfactory bulb?
a ganglion containing the synapses with the cell bodies of the 2nd neurones in the olfactory chain
Name the first neurones in the olfactory chain that are located within the ofactory mucosa.
Olfactory receptor cells
Which nerve supplies the anterosuperior part of the nasal cavity with somatic sensory nerves?
CN V1
In the nasal cavity, where does CN V2 supply and with what?
Posteroinferior part with soatic sensory nerves
Which artery(ies) supplies the face from its deep aspect and which artery supplies the face from a more superficial aspect?
Deep - maxillary artery and ophthalmic artery
Superficial - Facial artery
Which artery supplies the tongue?
Lingual artery
Which arteries suppply the lateral and septal wall of the nasal cavities?
Nasal branches of the ophthalmic artery
What is the approximate location of Kiesselbach’s (or “Little’s Area”) on the nasal septum?
Anteriorly and inferiorly in the nasal cavity
What arteries anastamose at Keisselbach’s area?
Facial, ophthalmic and maxillary arteries
Which concha is a bone in its own right?
Inferior concha
There are 2 nasal conchae which are extensions of waht bones?
Ethmoid bone
Name the 3 meatuses and one recess of the lateral wall of the nasal cavity?
Sphenoethmoidal recess
Superior meatus
Midde meatus
Inferior meatus
What are the functions of the nasal cavity?
Warm, humidify and remove particulate matter.
special sense of smell
drainage of mucous frm the paranasal sinuses
