What is "cerebrospinal fluid"?
Your brain and spinal cord are bathed in a fluid. In the brain, there are ventricles; just like the heart has ventricles, the brain has ventricles. The top of the spine, and the brain, and the spinal cord are surrounded by fluid. That fluid is to get rid of waste and also to bring nutrition. So, those are the two purposes of the spinal fluid. It has protein in it, it has a certain level of sugar in it, and has a number of other kinds of chemicals in it and so forth, but it is essentially a cushion, although it also has nutritional elements to it. Quite clearly, if you were to quickly stop your brain with a movement, theoretically there's some fluid cushioning to it, so it wouldn't so bad. Now obviously if you hit it too hard, it's not going to do much good, but spinal fluid is surrounding your brain, surrounding your spinal cord. When the spinal cord ends at around the end of the rib cage, the top of the lumbar spine, there's a sac there filled with spinal fluid, which is where we do our spinal tap. There's no spinal cord there, there are only the roots. So, God has given us a little space to find spinal fluid, right? Okay, now obviously, the younger the child, the smaller that space is, but as you grow up it becomes a space that's maybe three or four inches wide, and it's full of fluid.
