Hearing and Balance Disorders Flashcards

Which part of the ear is primarily responsible for detecting sound?

Answer: Cochlea

The cochlea is a spiral-shaped, fluid-filled structure located in the inner ear. It contains specialized hair cells that are responsible for converting sound vibrations into electrical signals. These signals are then transmitted to the brain via the auditory nerve, making the cochlea the primary organ for detecting sound and enabling hearing.

What is the most common cause of conductive hearing loss?

Answer: Otitis media

Conductive hearing loss occurs when sound waves cannot effectively reach the inner ear, often due to issues in the outer or middle ear. Otitis media, or middle ear infection, is a very common cause because fluid buildup behind the eardrum impedes the vibration of the tympanic membrane and ossicles. This obstruction prevents sound transmission, leading to hearing impairment.

Which structure is responsible for maintaining balance and spatial orientation?

Answer: Semicircular canals

The semicircular canals are three fluid-filled loops located within the inner ear, oriented in different planes. They are crucial components of the vestibular system, detecting rotational movements of the head. By sending signals to the brain, these canals play a vital role in maintaining our sense of balance and spatial orientation.

Which condition is characterized by episodes of vertigo, tinnitus, and fluctuating hearing loss?

Answer: Meniere’s disease

Meniere’s disease is a chronic inner ear disorder characterized by a classic triad of symptoms: episodic vertigo, fluctuating sensorineural hearing loss, and tinnitus (ringing in the ear). It is believed to be caused by an abnormal buildup of fluid (endolymph) in the inner ear, leading to pressure changes that affect both hearing and balance functions.

Which test is commonly used to diagnose vestibular disorders?

Answer: Caloric test

The caloric test is a common diagnostic tool used to assess the function of the vestibular system, particularly the horizontal semicircular canal. It involves irrigating the ear canal with warm or cold water/air to induce nystagmus (involuntary eye movements). This helps evaluate the brain's response to changes in inner ear temperature and detect vestibular disorders.

Which disorder is most commonly associated with aging and results in gradual hearing loss?

Answer: Presbycusis

Presbycusis is the most common type of sensorineural hearing loss, which gradually occurs as people age. It typically affects both ears equally and results from age-related changes in the inner ear, specifically the cochlea, or in the nerve pathways to the brain. This condition makes it harder to hear high-pitched sounds and understand speech in noisy environments.