The tympanic membrane, also known as the eardrum, is part of the middle ear, not the outer ear.

The pinna is the visible part of the ear and its primary function is to collect sound waves and direct them into the external auditory canal.

The middle ear contains three small bones called the malleus, incus, and stapes. These bones transmit sound vibrations from the eardrum to the inner ear.

The Eustachian tube is a small channel that connects the middle ear to the back of the throat. Its primary function is to equalize pressure between the middle ear and the environment, which is important for proper hearing.

The cochlea is a spiral-shaped structure in the inner ear that contains sensory cells called hair cells. These hair cells convert sound waves into electrical signals, which are then transmitted to the brain.

The semicircular canals are three fluid-filled tubes in the inner ear that help with balance. They detect changes in head position and send signals to the brain, which helps maintain equilibrium.

Tinnitus is a ringing, buzzing, or hissing sound in the ears that is not caused by an external source. It is a symptom of hearing loss, but not a type of hearing loss itself.

Earwax buildup is the most common cause of conductive hearing loss. It can block the external auditory canal and prevent sound waves from reaching the eardrum.

Difficulty hearing high-pitched sounds is a common symptom of sensorineural hearing loss. This type of hearing loss is caused by damage to the hair cells in the cochlea.

Vestibular nerve section is a surgical procedure to remove an acoustic neuroma. It involves cutting the vestibular nerve, which connects the inner ear to the brain.

Exposure to secondhand smoke, frequent colds and allergies, and enlarged adenoids are all risk factors for developing otitis media, an infection of the middle ear.

Retracted tympanic membrane is a condition in which the eardrum is pulled inward. It can be caused by a variety of factors, including allergies, infections, and Eustachian tube dysfunction.

Tinnitus, vertigo, and hearing loss are all symptoms of Meniere's disease, a disorder of the inner ear.

Tympanoplasty is a surgical procedure to repair a perforated eardrum. It involves grafting a patch of tissue over the perforation.

Hearing aids, masking devices, and cognitive-behavioral therapy are all treatments for tinnitus. The best treatment option depends on the individual patient.