Conversation so far:
which part of the cns is made up of the midbrain
The brainstem consists of the medulla, the pons and the midbrain.
what percentage of the brain is the brainstem
The brainstem is a very small component of the brain, making up only around 2.6 percent of the total weight of the brain.
why is the brain stem important
The brainstem is a crucial part of the brain providing the main motor and sensory nerve supply to the face and neck via the cranial nerves.

Question: what is the function of the nerves
Self-contained rewrite: what is the function of the cranial nerves