He does not have to think all the time where each finger is to go.

After the tunes have been played a great many times, the spinal cord knows them so well that it makes the hands play them almost without any effort of the large brain.
SUMMARY.
1.

The part of the body with which we think is the brain.
2.

The brain is found filling the hollow place in the skull.
3.

There are two brains, the large brain and the small brain.
4.