The author next turns his attention to the central nervous system.

They develop very early during development of the central nervous system.

Thus: surprise cannot tell us about the development of the central systems.

Doesn't anyone care what has been happening to their central nervous systems?

The number of cells within the central nervous system is very small.

Yes, you have your central nervous system to worry about.

The mayor created a special company to build the project and run the central system.

Most are little more than a brain and a central nervous system.

Do they have a central or federal system of government?

A central system was just what they had gone to great lengths to get away from.