Deep inside your brain are little rooms full of clear fluid. Ependymal cells line the walls and wave tiny hairs to keep the fluid moving.
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Your brain has a few hollow spaces called ventricles (VEN-trih-kulz). A thin tube runs down the middle of your spinal cord too. They are all filled with a clear liquid.
Ependymal cells (eh-PEN-dih-mul) sit side by side to line these spaces, like tiles on a wall. On top, many of them have tiny hairs called cilia (SILL-ee-uh).
Scroll up to the 3D model and press Wave the cilia. Then press Move the fluid.
The cilia beat back and forth together. This helps push the clear fluid along.
The fluid acts like a soft water cushion for your brain. It also helps carry away waste. Some special cells near the ventricles make this fluid.
Your body makes about two cups of this brain fluid every day, and keeps it fresh by slowly replacing it!