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The tympanic nerve (Jacobson's nerve) is a branch of the glossopharyngeal nerve passing through the petrous part of the temporal bone to reach the middle ear. It provides sensory innervation for the middle ear, the Eustachian tube , the parotid gland , and mastoid cells .
Similar studies have shown a possible link between that hearing loss and neuropathy (nerve damage). Tumor Cerebellopontine angle tumour (junction of the pons and cerebellum ) – The cerebellopontine angle is the exit site of both the facial nerve (CN7) and the vestibulocochlear nerve (CN8).
The diagnosis is made by the combination of symptoms and examination of the tympanic membrane for redness, bulging, and/or a middle ear effusion (collection of fluid within the middle ear). [5] Complications of otitis media include hearing loss, facial nerve paralysis, or extension of infection to surrounding anatomic structures, including: [24]
Whilst hearing loss is a common symptom in many diseases of the ear, for example in otosclerosis (abnormal bone growth in the ear), [3] the white, chalky patches on the tympanic membrane are fairly characteristic of tympanosclerosis. Cholesteatoma is similar in appearance but the whiteness is behind the tympanic membrane, rather than inside.
The vibration of the tympanic membrane drives the middle ear ossicles, the malleus, incus, and stapes to vibrate in sync with the eardrum. The middle ear ossicles transfer mechanical energy to the cochlea by way of the stapes footplate hammering against the oval window of the cochlea, effectively amplifying the sound signal.
Conductive hearing loss (CHL) occurs when there is a problem transferring sound waves anywhere along the pathway through the outer ear, tympanic membrane (eardrum), or middle ear . If a conductive hearing loss occurs in conjunction with a sensorineural hearing loss, it is referred to as a mixed hearing loss.
A perforated eardrum (tympanic membrane perforation) is a prick in the eardrum. It can be caused by infection (otitis media), trauma, overpressure (loud noise), inappropriate ear clearing, and changes in middle ear pressure. An otoscope can be used to view the eardrum to diagnose a perforation. Perforations may heal naturally or require surgery.
Auditory neuropathy a disorder of poor speech perception even though the tympanic membrane, middle ear structures, and cochlear nerve are intact. [29] [30] People with auditory neuropathy may have normal hearing or hearing loss ranging from mild to severe. Inherited disorders People with Down syndrome are more likely to have hearing loss. [31]