Final answer:
Ventricles in the brain are fluid-filled spaces interconnected and filled with cerebrospinal fluid circulating throughout the central nervous system.
Explanation:
Ventricles are fluid-filled areas within the brain that are interconnected and filled with cerebrospinal fluid. There are four ventricles in the brain: two lateral ventricles, the third ventricle, and the fourth ventricle, which is between the cerebellum and the pons. Ventricles play a crucial role in circulating cerebrospinal fluid throughout the central nervous system.
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