What Is the Blood-Brain Barrier
Reviewed: Dr. Gromatzky
2. Endothelial Cells
The protective barrier is made mostly from endolithic cells, a type of cell that is commonly found lining the walls of blood vessels. In the blood-brain barrier, these cells are tightly packed together to form the barrier. This wall is only one layer thick, and the right elements will be able to pass directly through the cells.
The endothelial cells are supported with help from astrocytic end feet. These are structures that are extensions of astrocytic cells and almost act as buttresses in supporting the endothelial cells. Together, and along with some other cells, these form a barrier that helps keep the brain safe.
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