Question

The eighth cranial nerve of vertebrates leads from the brain to
A. Ear
B. Eye
C. Nose
D. Tongue

Answer 1

Hint: Our brain controls all the sensory, motor and autonomic reflexes in our body. There are various nerves/cells specialized in the brain to make this connection feasible and make our body to function. This well helps our body to work in coordination. Nerves in the brain are called cranial nerves.

Complete answer:
What are cranial nerves? Our brain is connected to different parts of our body via these nerves called cranial nerves. There are 12 cranial nerves in our body, each having a particular function.
Let us learn about the cranial nerves connected to the options.
Option A: Ear: The cranial nerve 8 arises from the pons varolii of the brain which is connected to the internal ear. It holds the function of hearing and equilibrium. Its one branch is connected to cochlea while the other to the vestibular apparatus.
Option B: Eye: Cranial nerve 6 is connected to the optic nerve, oculomotor nerve, facial nerve etc. it means they are leading to the vision and sight sensory structures.
Option C: Nose: The nose forms the olfactory nerve which is led by the first cranial nerve. It gives sensory information about the smell. It passes its receptors in the nasal mucosa to the forebrain.
Option D: Tongue: Cranial nerve 12 is responsible for the muscles of the tongue. It is solely having a motor function. It is also called the hypoglossal nerve.

So the answer is option A: Ear.

Note:
Cranial nerve 8 is called the vestibular nerve. It has cochlear and vestibular nerves. Swelling in the inner ear can cause vestibular neuritis. These nerves enter the pontomedullary junction at the brain stem. It has the limited ability to repair itself.