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Muscles of auricle innervation
Facial N. (CN VII)
External ear innervation
Auricular branch of Glossopharyngeal N (CN IX) and Vagus N (CN X)
External auditory canal gag reflex N.
Glossopharyngeal N (CN IX)
External auditory canal cough reflex
Vagus N (CN X)
CN IX and X
Chronic infection of the ear leads to:
Bony hyperplasia and narrowing of meatus.
Clinical examination of ear tool
Otoscope or Auriscope
Incision through tympanic membrane for pus drainage caused by otitis media
Tensor tympani muscle innervation
Mandibular N (CN V3)
Stapedius muscle innervation
CN VII, stapedius branch
Stapedius muscle function
Causes loss of function of stapedius muscle which leads to hyperacusis (increased sensitivity to sound)
Facial nerve paralysis
Bony roof and floor of tympanic membrane are very thin, leading to infection of what?
Meningitis and cerebral abscess in temporal lobe
What can lead to rupture of tympanic membrane?
Pressure differnce of 100-150 mmHg
What is the most common cause of deafness in adults?
Otosclerosis, which disturbs movement of the stapes.
Reacts in linear acceleration:
Macula sacculi and macula utriculi
Reacts in angular acceleration:
Cristae ampullares (3)
Nerve involved in hearing
Nerve involved in balance
Acute Otitis Media
Otitis Media Effusion
Secretory Otitis Media
Anatomy of the ear