Functioning of Vestibulocochlear Nerve The vestibulocochlear nerve is also called the acoustic or the auditory nerve. As we all know that there are twelve types of cranial nerves, vestibulocochlear nerve being the eighth one. The main function of this type of nerve is to transfer balance and sound to the inner ear.
The information is received by the inner ear and it is finally transferred to the brain. The auditory nerve has its origin from the embryonic optic placode. Initially it had many names because its functions were totally uncertain.
Structure and function
These types of nerves alongside hair cells provide information to the inner ear and finally this information reaches the brain. It consists of two kinds of nerves. The cochlear nerves carry all the hearing information while the vestibular nerves carry all the information regarding balance and support. It comes out from the pons and it is found in the temporal bones of a human body.
Supplying organs with nerves
The vestibulocochlear nerve comprises of bipolar neurons and they can be separated in two big divisions. The vestibular nerves and the cochlear nerves are the two divisions. The cochlear of the inner ear doesn’t always experience the effect of cochlear nerve as it flees to some other part and results in spiral ganglia. It is processed from the organ of corti and it denotes the conduction of nerves to the spiral ganglia. The receptors receive the conduction of nerves mainly from organ of corti. The inner hair cells initiate this process. No one knows about the mechanism by which sound is transferred by neurons present in the cochlear nerve. Temporal theory and place theory are the two theories that compete.
The vestibulocochlear nerve consists of the vestibular nerve which visits the inner ear from the vestibular system. There is a vestibular ganglion which consists of certain cell bodies which extend the process to five different sensory organs. Cristae complete three of these nerves.
The semicircular canals consist of ampullae in which cristae is generally found. Due to rotational acceleration the hair cells present in cristae activate the receptors that receive the conduction of nerves.
The utricle and maculae of the saccule are the other two different sensory organs provided by vestibular neurons. Due to linear acceleration the hair cells present in maculae activate the receptors that receive the conduction of nerves.
Symptoms of damage
When a vestibular nerve present in the vestibulocochlear nerve is destroyed it may result in certain symptoms.
-Loss in hearing- a person whose vestibular nerve is destroyed can have a damaged ear or even both the ears can be damaged. This results in hearing loss.
-Vertigo- It is one of the common symptoms found when a vestibular nerve is destroyed. -It results in dizziness, fatigue and vomiting.
-False sense of motion- It results in sleep walking.
-Loss of balance and support- A person with a damaged vestibular nerve often loses his balance in the dark.
-Motion sickness- It is a type of sickness one experiences as a result of a damaged vestibular nerve.