TBI · Traumatic Brain Injury

Brain in a Rigid Box

Your brain is like a phone packed tightly inside a rigid plastic case filled with protective gel (cerebrospinal fluid). When you drop the phone hard, the screen cracks at the point of impact (focal contusion) AND the circuitry inside gets shaken loose and bent (diffuse axonal injury). The cracked screen leaks liquid that pools inside the case (intracranial bleeding (hemorrhage)), and the gel itself puffs up from the damage (cerebral swelling (edema)). Because the case cannot stretch, all this extra stuff—blood, swollen gel, crushed circuits—pushes harder and harder on what's left (rising ICP). The harder it pushes, the less new power can flow into the phone's circuits (dropping CPP), so the phone's functions start failing. Finally, if pressure gets extreme enough, pieces of the phone get shoved into corners of the case where they don't belong, breaking the most critical parts (herniation of vital brainstem structures).