Paranasal sinuses and the Ear Kate Dahill and Katie Joyce.
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Transcript of Paranasal sinuses and the Ear Kate Dahill and Katie Joyce.
![Page 1: Paranasal sinuses and the Ear Kate Dahill and Katie Joyce.](https://reader036.fdocuments.net/reader036/viewer/2022062421/56649d8c5503460f94a73b5b/html5/thumbnails/1.jpg)
Paranasal sinuses and the EarKate Dahill and Katie Joyce
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Sinuses… Just hollow parts of the skull May get infected, and the infection may spread
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What type of cells line the sinuses? Respiratory mucosa - ciliated pseudostratified columnar
epithelium
So, they produce mucus, which drains into…. The nasal cavity
Which sinuses don’t drain with gravity..? Maxillary
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SPHENOID sinus drains to SPHENoethmOID recess Others drain to Hiatus semilunaris
Sphenoethmoid recess
Hiatus Semilunaris
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Innervation All EXCEPT MAXILLARY innervated by…
CN Va
Which is innervated by.. CN Vb
Pain referral? Frontal head Maxillary – maxillary teeth
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Tympanic membraneFlaccid part
Cone of light
Umbo
Tense part
Handle of malleus
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3 layers of tympanic membrane:
Skin CN Vc and X
Mesoderm
Respiratory mucosa CN IX (middle ear and auditory tube)
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What is in the middle ear? BONES:
Malleus Incus (Inbetween) Stapes (like a stirrup)
Muscles: Tensor tympani – connected to
malleus CN Vc
Stapedius – connected to stapes CN VII
Without muscles -> hyperacusis
Branches of the facial nerve
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Pharyngotympanic OR Eustachian OR Auditory tubeWhat does it do?
Equalises pressure between middle ear and throat Drains mucus
When your ears ‘pop’ it’s your eustachian tube opening.
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Which pharyngeal arches does the ear derive from?
1 & 2
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What is the sensory innervation of the ear? How do you test this?
CN 8 Rinnes and Webers:
Weber;-Tuning fork on forehead and ask where patients hears the sound/vibration and does it lateralise -Normal; no lateralisation -Conduction deafness; sound lateralised to AFFECTED ear-Sensorineural deafness; sounds lateralised to NORMAL ear
Rinne;-Tuning fork on mastoid til sound stops then hold in air by EAM-Air conduction should be better than bone conduction-Conduction deafness; no note at EAM
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Rinne Weber
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What is the difference between conductive and sensorineural hearing loss?
Conductive loss; sound cant travel to inner ear e.g. outer or middle ear blockage
Sensorineural loss; damage to the hair cells within the cochlea or CN VIII
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THE END