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The primary function of the ossicular chain is to transmit sound vibrations from the external ear to the inner ear, where they are converted into electrical signals for the brain to interpret as sound. Any dysfunction or damage to the ossicular chain, such as ossicular discontinuity, can lead to conductive hearing loss.
The ossicles are suspended in the head and loosely coupled to the skull. When the head moves, the ossicles move out of phase with the head, but still follow the same cyclic motion. This causes the stapes to move in and out of the oval window. When vibrations come from the mastoid, inertial bone-conduction is greatest below 800 Hz. Putting the ...
Most causes of conductive hearing loss can be identified by examination but if it is important to image the bones of the middle ear or inner ear then a CT scan is required. CT scan is useful in cases of congenital conductive hearing loss, chronic suppurative otitis media or cholesteatoma, ossicular damage or discontinuity, otosclerosis and ...
In traumatic brain injury (TBI), primary brain injury occurs during the initial insult, and results from displacement of the physical structures of the brain. [1] Secondary brain injury occurs gradually and may involve an array of cellular processes. [1] [2] Secondary injury, which is not caused by mechanical damage, can result from the primary ...
The middle ear contains three tiny bones known as the ossicles: malleus, incus, and stapes. The ossicles were given their Latin names for their distinctive shapes; they are also referred to as the hammer, anvil, and stirrup, respectively. The ossicles directly couple sound energy from the eardrum to the oval window of the cochlea.
Glasgow Coma Scale (GCS) is the most widely used scoring system used to assess the level of severity of a brain injury. This method is based on the objective observations of specific traits to determine the severity of a brain injury. It is based on three traits: eye opening, verbal response, and motor response, gauged as described below. [35]
Clinical data additionally shows that bilateral damage to the insula after ischemic injury or trauma can lead to auditory agnosia. [85] Functional magnetic resonance studies have also demonstrated that the insular cortex participates in many key auditory processes such as tuning into novel auditory stimuli and allocating auditory attention.
The hair cells are the primary auditory receptor cells and they are also known as auditory sensory cells, acoustic hair cells, auditory cells or cells of Corti. The organ of Corti is lined with a single row of inner hair cells and three rows of outer hair cells. The hair cells have a hair bundle at the apical surface of the cell.