Flashcards in Anatomy Deck (167)
Which structure gives rise to the cupid's bow?
From which part of the nasal cavity to we get sense of smell?
Nasal septum - anterior component
Nasal septum - posterior compartment
- perpendicular place of ethmoid bone (superiorly)
- vomer (inferiorly)
What divides the nasal cavity from the anterior cranial fossa?
Cribiform plate of ethmoid bone
Where is the crista galli of the ethmoid located?
medially and superiorly.
Superior to the nasal septum
Which conchae are part of the ethmoid bone?
Superior and middle
Where are the conchae located?
In the lateral wall of the nasal cavity
Function of conchae?
They create turbulence of the nasal cavity which ultimately creates better gas exchange
Where are the meatuses in relation to the conchae?
The space under each concha where the paranasal sinuses drain into
What are paranasal sinuses?
Extensions of the nasal cavities which aim to make the skull lighter
Name the 4 paranasal sinuses
Frontal sinus (2)
Maxillary sinus - antra (2)
Ethmoidal air cells (2)
Sphenoid sinus (2)
Where do frontal sinuses drain to?
Where do maxillary sinuses drain to?
Where do ethmoidal air cells drain to?
Anterior and middle drain into middle meatus
Posterior drains into superior meatus
Where do sphenoid sinuses drain to?
What drains into the inferior meatus?
3 types of mucosa in the nasal cavities
Keratinised stratified squamous epithelium
Keratinised stratified squamous epithelium in the nasal cavities
Located at the entrance of the nostril
The verbose hairs here start to filter foreign objects out of the air that you are breathing in
Respiratory epithelium in nasal cavities
This makes up the majority of the nasal cavity mucosa
Warms the air
Humidifies the air
Traps foreign bodies
Special sensory nerve supply to the nasal cavities (e.g. for smell)?
CN I (olfactory)
Where does CN 1 leave the brain?
Cribriform plate of ethmoid bone
Somatic nerve supply to the nasal cavities (e.g. for ho, cold, touch, pain)?
CNV1 (ophthalmic division) supplies anterosuperiorly
CNV2 (maxillary division) supplies posteroinferiorly
Which arteries does blood supply to the nasal cavities originate from?
External and internal carotid arteries
Branching of internal carotid artery which supplies the nasal cavities
Internal carotid artery ->
Ophthalmic artery ->
Anterior and Posterior ethmoidal artery -> supplies the medial and lateral walls of the nasal cavity
Branching of external carotid artery which supplies the nasal cavities
External carotid artery -> facial artery and maxillary artery
Facial artery -> lateral and septal branch
Maxillary artery -> sphenopalatine artery (lateral and medial walls), greater palatine (medial wall only)
What is Kiesselbach's area
The anastamotic site of the nasal arteries in the nasal septum.
It is the most common site of epistaxis (nosebleed)
NG tube is passed through the SUPERIOR/INFERIOR aspect of the nasal cavity
How do you ensure an NG tube has been correctly inserted into a patient?
- NG tube should remain in the midline down to the level of the diaphragm and the tip should be seen in the diaphragm