Ear-eustachian Tube Flashcards
Length of the eustachian tube and length of its bony and cartilaginous parts
Length – 36 mm
Outer 12 mm is bony (Columnar)
Inner 24 mm cartilaginous(pseudostratified columnar)
Difference of eustachian tube in adults and newborn
Add birth the osseous portion is longer than cartilaginous,Nearly horizontal, shorter, wider
In adults it is at 45° angle with horizontal
Which muscle opens the eustachian tube
Tensor veli palatini
What is the main function of the Eustachian tube
Middle ear ventilation
Eustachian tube function test (name)
Valsava
ET catheterisation
ET Politzerisation
Tympanometry
When eustachian tube is blocked what happens to middle ear and tympanic membrane
There is negative pressure in the middle ear
And there is a retraction of the tympanic membrane
Features of retracted Tympanic membrane
- Dull in appearance
- handle of malleus medialised
- Cone light is distorted
- lateral process of malleus is more prominent
- on seigellisation, TM shows less or no movement
What a retraction pockets
Too much retraction of Tympanic membrane
What does retraction pocket consist of
They are lined by skin and are filled by keratin
What is cholesteatoma
Skin in the middle ear
What is primary acquired cholesteatoma
It is due to retraction pockets
Glue ear also known as (3)
Serous otitis media
Secretory otitis media
Otitis media with effusion
Fluid in glue ear
Sterile/non sterile?
Sterile
MC aetiology for glue ear (SOM) in children
Adenoid hypertrophy
Rare ethology of SOM in adults
NPC
