From superior to inferior, name the parts of the external nose.
Root (between eyebrows)
Dorsum (the bridge of the nose)
Apex (tip of the nose)
Septum (separates the right and left nasal cavities)
Philtrum (indentation in the midline, just superior to the upper lip)
Which bone forms the bridge of the nose?
What are the sides of the nose found on either side of the apex?
What is the technical name for the nostrils?
Which two bones make up the nasal septum?
Perpendicular plate of the ethmoid bone
Apart from the vomer, which bone forms the superior part of the nasal septum?
What are the two important structures of the roof of the nasal cavity?
Which bone do they belong to?
Both part of the ethmoid bone
In which cranial fossa are the cribriform plate and crista galli found?
Anterior cranial fossa
Which ganglia of CN I sit on the cribriform plate of the ethmoid bone and are separated by the crista galli?
Which structures of the ethmoid bone are found on the lateral wall of the nasal cavities?
Superior and middle conchae
Ethmoidal air cells
Which part of the ethmoid bone separates the nasal cavity from the bony orbit?
Which of the three conchae are part of the ethmoid bone?
Superior and middle conchae
Inferior conchae is its own thing
Which particular part of the ethmoid bone makes up the nasal septum?
Is the nasal septum always found in the midline?
Slightly deviated in most people
Which type of fracture can damage the cribriform plate of the ethmoid bone?
Which types specifically?
Le Fort fracture
II & III
Why can Type II & III Le Fort fractures cause meningeal infections?
Transmission of bacteria from
nasal cavity and paranasal sinuses
anterior cranial fossa
via damaged cribriform plate
The conchae are found on the (medial / lateral) sides of the nasal cavities.
medial side is quite featureless
Which bone joins with the maxilla to form the hard palate at the floor of the nasal cavity?
Which parts of the sphenoid bone act as insertions for the medial and lateral pterygoids and is found near the nasal cavity?
(remember medial CLOSES the jaw and lateral OPENS it)
The cribriform plate is shaped like a sieve - why?
Allows passage of CN I (olfactory nerve)
The ethmoid air cells form one of the paranasal ___.
Is the inferior concha part of the ethmoid bone?
Superior and middle concha ARE
The stratified squamous epithelium at the anterior part of the nasal cavity is ___.
What does this achieve?
Stops foreign stuff getting into the nasal cavities
Most of the nasal cavity is lined with respiratory epithelium.
What is this specifically?
CILIATED PSEUDOSTRATIFIED COLUMNAR epithelium with GOBLET CELLS
Don't forget this
What kind of epithelium is found at the superolateral part of the nasal cavity?
Where is olfactory epithelium found?
What is its function?
Superolateral nasal cavity
Sense of smell
Which cranial nerve is responsible for smell?
Which structures do the nerve fibres for CN I pass into once they have gotten up through the cribriform plate?
What type of fibres are found in CN I?
(Optic nerve is also special sensory because sight is one of the special senses)
Nerve fibres for CN I pass through which part of the ethmoid bone?