What cells help to feed the brain and make up the Blood Brain Barrier?

Astrocytes are a type of glial cell in the central nervous system that play a critical role in supporting and protecting neurons. They help to maintain the blood-brain barrier, which is essential for regulating the environment of the brain and ensuring that harmful substances in the blood do not enter the brain tissue. Astrocytes facilitate the transport of nutrients from the bloodstream to neurons and contribute to the structural integrity of the blood-brain barrier by forming tight junctions with endothelial cells. This protective barrier is vital for maintaining the brain's homeostasis and overall function, making astrocytes crucial for both nutrient supply and protection of neural tissue.