upper airway Flashcards
paranasal sinuses: describe their relationship to the nasal cavity and sites of drainage, and explain their innervation
what is a sinus
air-filled space
3 functions of sinuses
reduce weight of skull, provide crumple zone to protect brain, help to produce resonant sound to project voice
4 sinuses in front of head
frontal sinuses, ethmoid air cells, sphenoid sinuses, maxillary sinuses
what nerve supplies all sinuses
trigeminal nerve (CN V)
what sinus does only V1 supply
frontal sinuses
what sinuses do both V1 and V2 supply
ethmoid air cells, sphenoid sinuses
what sinus does only V2 supply
maxillary sinuses
colour of sinuses on x-ray
very dark
where do sinuses drain
into meatuses of nasal cavity
tube which connects nasopharynx to middle ear
pharyngotympanic auditory tube
what drains the frontal sinuses and anterior ethmoidal cells
infundibulum opening of frontonasal duct (middle meatus)
where is the opening of middle ethmoidal cells
ethmoidal bulla (middle meatus)
where is the opening of posterior ethmoidal cells
lateral wall of superior meatus
what does the sphenoidal sinus drain into
spheno-ethmoidal recess
where is the opening of the maxillary sinus
in floor of semilunar hiatus
