Nose Anatomy Flashcards Preview

ENT & Ophthalmology > Nose Anatomy > Flashcards

Flashcards in Nose Anatomy Deck (10):

What is the overall structure of the nose?

Bony and cartilaginous components
Roof: cribiform plate of the ethmoid bone
Floor: palatal shelf of the maxilla
Anterior: nares (nostrils)
Posterior: chonae (open in to nasopharynx)
Medial: nasal septum
Lateral: superior, middle and inferior turbinates


Why is it possible for the infection in the frontal sinus to drain in to the maxillary sinus?

Due to the semilunaris hiatus between the two opening in the Middle meatus


How do the paranasal sinuses drain in to the nasal cavity?

Frontal sinus - frontonasal duct in to the middle meatus
Maxillary sinus - middle meatus
Ethmoid: anterior - middle meatus via the infundibulum
Middle - middle meatus
Posterior - superior meatus

Nb the nasolacrimal ducts drain in to the inferior meatus


What is the arterial supply to the nose?

ECA - facial - superior labial artery
ECA - maxillary - sphenopalatine and greater palatine arteries
ICA - ophthalmic - anterior and posterior ethmoidal arteries


What is the venous drainage of the nose?

Cavernous sinus, facial vein, pterygoid plexus


What happens in a nasal fracture?

History of force to the face, presenting with deformity
Complications include septal haemotoma - avascular necrosis
Saddle nose deformity


What is rhinitis?
What are the possible causes?

Inflammation of the nasal mucosa leading to a swelling and increased volume of secretion
Nasal polyps, viral infections, allergies


What are the possible consequences of nasal polyps?

They grow close to the ostiomeatal complex of the nasopharynx
It can lead to nasal obstruction - snoring/obstructive sleep apnoea


What is sinusitis?
What are the possible causes?

Inflammation of the mucosal lining of the sinuses
It can be subacute, acute or chronic
Infection - viral with secondary bacterial infection due to mucous overproduction and nasal obstruction (strep pneumoniae and Haemophilius influenzae)


Why might a child with recurrent ear infections benefit from an adenoidectomy?

Due to lots of lymphoid tissue around the opening of the Eustachian tube in to the nasopharynx - removal allows correct drainage of mucous from the tympanic cavity