The Blood Brain barrier (BBB) is a selectively permeable barrier that protects the brain from harmful substances. The mentioned video converses about the Blood Brain barrier in detail and talks about how cerebral edema is caused. Timeline: 00:01 introduction 01:04 the blood-brain barrier 02:54 ischemia of BBB 04:09 vasogenic edema 04:57 brain swelling 05:31 slow resolution of vasogenic edema