Choroid Plexus Epithelial Cells (Brain Fluid Makers)

Frilly fluid factories

Deep inside your brain are a few connected spaces filled with fluid. In them is a frilly, bumpy tissue called the choroid plexus. It looks a bit like a tiny cauliflower.

Each bump has blood vessels in the middle and a single layer of cube-shaped cells on the outside. Their tops are covered with tiny fingers that give them lots of surface.

Making the brain's cushion

These cells take water and other things from the blood and make cerebrospinal fluid. It flows around your brain and spinal cord.

• It cushions your brain from bumps.
• It helps carry away waste.
• The cells are joined tightly, so they also act as a gate that controls what gets in.

Brain fluid quiz