The vestibulocochlear nerve is responsible for the sense of hearing and balance (body position sense). The glossopharyngeal nerve enervates muscles involved in swallowing and taste.
Is the cochlea part of the central nervous system?
Auditory processing begins in the cochlea of the inner ear, where sounds are detected by sensory hair cells and then transmitted to the central nervous system by spiral ganglion neurons, which faithfully preserve the frequency, intensity, and timing of each stimulus.
Is the auditory nerve the 7th nerve?
The vestibulocochlear nerve (auditory vestibular nerve), known as the eighth cranial nerve, transmits sound and equilibrium (balance) information from the inner ear to the brain.
Is auditory nerve the same as cochlear nerve?
The cochlear nerve, also known as the acoustic or auditory nerve, is the cranial nerve responsible for hearing.
What is Ramsay Hunt Syndrome?
Ramsay Hunt syndrome (herpes zoster oticus) occurs when a shingles outbreak affects the facial nerve near one of your ears. In addition to the painful shingles rash, Ramsay Hunt syndrome can cause facial paralysis and hearing loss in the affected ear.
What are the cochlear nerves?
The acoustic or cochlear nerve is a sensory nerve essential for hearing. Together with the cochlea and the central pathway from the nucleus in the pons to the temporal cortex, it is part of the auditory system.
What forms the cochlear nerve?
The longer central fibers, also called the primary auditory fibers, form the cochlear nerve, and the shorter, peripheral fibers extend to the bases of the inner and outer hair cells. They extend radially from the spiral ganglion to the habenula perforata, a series of tiny holes beneath the inner hair cells.
How many nerves are in the cochlea?
Both the peripheral process and the axon are myelinated. In humans, there are on average 30,000 nerve fibers within the cochlear nerve. The number of fibers varies significantly across species; the domestic cat, for example, has an average of 50,000 fibers.
What part of your brain tells you to swallow?
The voluntary initiation of swallowing takes place in special areas of the cerebral cortex of the brain called the precentral gyrus (also called the primary motor area), posterior-inferior gyrus, and the frontal gyrus.
Are there nerves in your ears?
The Inner Ear: Nerve Signals Start Here
The snail-shaped cochlea changes the vibrations from the middle ear into nerve signals. These signals travel to the brain along the cochlear nerve, also known as the auditory nerve. The semicircular canals look like three tiny connected tubes. It’s their job to help you balance.
What can damage the cochlear nerve?
Many things can cause SNHL, or cochlear damage, including loud or extended noise exposure, certain powerful antibiotics, men- ingitis, Meniere’s disease, acoustic tumors, and even the natural decline in age can cause hearing loss.
Can the cochlear nerve heal?
Once damaged, your auditory nerve and cilia cannot be repaired. But, depending on the severity of the damage, sensorineural hearing loss has been successfully treated with hearing aids or cochlear implants.
What is the spinal accessory nerve?
The spinal accessory nerve originates in the brain and enables motion in the trapezius and sternomastoid muscles in the neck. A spinal accessory nerve injury can be caused by trauma or damage during surgery, resulting in shoulder pain, “winging” of the shoulder blades and weakness of the trapezius muscle.
What is the main function of the auditory nerve?
The cochlear nerve, also known as the acoustic nerve, is the sensory nerve that transfers auditory information from the cochlea (auditory area of the inner ear) to the brain. It is one of the many pieces that make up the auditory system, which enables effective hearing.
Which is auditory nerve?
Medical Definition of auditory nerve
: either of the eighth pair of cranial nerves connecting the inner ear with the brain, transmitting impulses concerned with hearing and balance, and composed of the cochlear nerve and the vestibular nerve.
What happens when the auditory nerve is damaged?
When the auditory nerve is damaged, the primary symptoms are sensorineural deafness and/or vertigo. The auditory nerve is the 8th cranial nerve. It connects the inner ear to the brain. The auditory nerve divides into two branches: the cochlear nerve and the vestibular nerve.
What are the 8 cranial nerves?
olfactory, optic, oculomotor, trochlear, trigeminal, abducens, facial, vestibulocochlear, glossopharyngeal, vagus, spinal accessory, hypoglossal. Still can’t remember the cranial nerves?
What illness did Tony Horton have?
In 2017 Horton revealed that he was diagnosed with Ramsay Hunt syndrome type 2.
What is facial nerve palsy?
In facial nerve palsy, patients cannot move the upper and lower part of their face on one side; in contrast, central facial nerve lesions (eg, due to stroke) affect primarily the lower face.
How do you rule out shingles?
Shingles is usually diagnosed based on the history of pain on one side of your body, along with the telltale rash and blisters. Your doctor may also take a tissue scraping or culture of the blisters for examination in the laboratory.
Where are the cranial nerves?
Cranial nerves are the nerves that emerge directly from the brain (including the brainstem), in contrast to spinal nerves (which emerge from segments of the spinal cord). Cranial nerves relay information between the brain and parts of the body, primarily to and from regions of the head and neck.
What is acoustic nerve?
Glossary. acoustic nerve: the eighth cranial nerve, also known as the vestibulocochlear nerve, is responsible for hearing and balance. brainstem: connects the upper brain to the spinal cord; responsible for autonomic functions such as breathing and heart rate.