What circulates through the ventricles? what is the function?

Cereberospinal fluid circulates through the ventricles.

The main function is cereberospinal fluid is the protection from the shock and distribute nutrients..

Explanation:

Ventricles are the four cavites of braion. Cereberospinal fluid is filled in these ventricles. This fluid is colorless, clear and produced by the ependymal cells.

Cereberospinal fluid has the ability to absorb the physical shock and thus protect the brain from any shock. This fluid helps in the exchange of nutrients and removal of waste material from the tissues. Cereberospinal fluid provides the stable chemical environment to the nervous tissue.