What Happens To Your Brain When You Move Your Head?
Quantitative Imaging Methods for the Development and Validation of Brain Biomechanics Models I'll be honest. I didn't understand a lot of what the paper discussed because it talked about the techniques they used to image the brain during movement. However, some of the videos they shared in the supplementary materials are stunning and really help us understand why concussions can happen with violent movement of the neck.
Brain Movement and Head Movement Let's take a quick look at this gif of the brain on a tagged MRI. That's amazing! Look at that grayish stuff covered in a grid pattern. That stuff is the brain inside of a skull as the head turns normally. Does it remind you of anything? It reminds me of a plate of jello when you set it on a table for the first time. It gives us a good reminder of a couple of concepts.
The brain really is a soft semi-gelatinous organ that can deform and reform it's shape pretty easily
The brain isn't a static structure. Normal head movement causes very conspicuous movement of your brain even with the surrounding barrier of cerebral spinal fluid. You can take a look at some videos taken directly from the study at the end of this article.