Which of the following is true of CSF?

a. CSF is produced within the venous sinuses.
b. CSF flows from the lateral ventricles toward the fourth ventricle.
c. CSF is produced in the fourth ventricle and flows toward the fifth ventricle.
d. CSF is a by-product of nerve cell activity.
e. CSF production is sped up during a seizure.

Answer: b. CSF flows from the lateral ventricles toward the fourth ventricle.