Ear anatomy recap Flashcards
Which bone does the middle ear lie in?
Temporal
Boundaries of the middle ear
Tympanic membrane to lateral walls of inner ear
Function of middle ear
Transmit sound vibrations from trympanic membrane to inner ear via auditory ossicles
How does the middle ear communicate with the nasopharynx?
The eustachian tube
What are the functions of the eustachain tube?
Equalising pressure between the middle ear and atmosphere
Drainage of middle ear mucus secretions
What part of the tympanic membrane is most likely to rupture?
Pars flaccida - most thin and flaccid area (pars tensa is rest)
What bone can be seen on th etympanic membrane?
Maleolus
What is the clinical significance of the roof of the middle ear?
Route of infection for otitis media to spread intra cranial to the middle cranial fossa through thin petrous part of temporal bone
Where are the auditory ossicles located?
the epitympanic recess - lateral wall of middle ear
What produces a bulge in the medial wall of the middle ear?
the facial nerve
What are the two openings in the anterior wall of the middle ear?
Auditory tube
Tensor tympani muscle
what does the anterior wall of the middle ear seperate it from?
Internal carotid artery
Where are the mastoid air cells related to the middle ear
Posterior wall - communicate with a hole = aditus to the mastoid antrum
