brain protection

What am I? I protect the brain. If the brain were china I would be the great wall of china. In my eyes I’m like the bodyguard for the brain but don’t just take my word for it I don’t have any eyes. I form a thick barrier between the brain and the outside world. I protect the major part of the nervous system and man am I nervous. You see without me the brain would be crushed by the outside world not to mention gravity. I am the skull or the cranium if you like you can even call us bone heads.

In the brain, the four most important arteries (known as cerebral arteries) are the two vertebral arteries and two carotid arteries. They are similar to a highway. They provide a way for the blood cells to take oxygen and food to the brain. I guess the blood cells are like trucks. The vertebral arteries enter the skull from the back and take blood to the brain stem and cerebellum. The two carotid arteries go to the front of the neck and supply the two brain hemispheres. All four arteries come together to form a circle, and if there is a problem in one vessel the other take over.
CSF
CFS stands for cerebrospinal fluid. CFS is stored in the cavities called ventricles in the brain. It is produced by the choroid plexus in the third and fourth ventricles. Usually people have about 125-150 mls. It surrounds the brain in the subarachnoid space ( the space between the brain and the outer covering called the meninges). It helps protect the brain by cushioning it and the brain weighs less because it is supported by the fluid. It takes waste products away from the brain and transports useful hormones to other parts of the brain. If doctors want information about the brain they put a needle in to the back and take a small amount of the fluid surrounding the spinal cord to test it for infections.