For individual's with NF2, tumors are expected to grow on Cranial Nerve 8 (CN 8) - Vestibulocochlear Nerve; which controls hearing and balance. It is not uncommon for tumors on CN 8, to also damage CN 7 the Facial Nerve. Tumors also commonly grow on the; Optic Nerve (CN 2), the Trigeminal Nerve (CN 5), and Vagus Nerve (CN 10). It is possible for tumors to grow and damage any other cranial nerves as well. These nerves are sometimes damaged as a result of Schwannoma, tumors that grow as a part of a nerve, but damage can also be the result of Meningioma, tumors that cause damage as a result of intracranial pressure.
Many Cranial Nerves have more than one function, for example when a Schwannoma grows on the Vestibular Nerve; it results in loss of function of Hearing and Balance, since the Vestibular Nerve is very close to the Cochlear Nerve.
There are 12 pairs of nerves in the Central Nerve System, a left and a right nerve for each. Some control muscles and others control senses. The Cranial Nerves (CN) include:
CNI (Cranial Nerve 1), is the only Cranial Nerve that can regenerate completely if damaged.
CNII (Cranial Nerve 2), carries Vision to the brain. This nerve does not contain Schwann cells.
CN3, (Cranial Nerve 3) has two functions it controls:
CN IV (Cranial Nerve 4), controls eyeball movement, rotating, up, down, left and right.
Lateral Rectus Muscle: lateral vision
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