A diagram of the immune-privileged site of the brain. It shows the structure of the human brain including the eye brain and spinal cord. The brain is shown in a side view with the left side of the image showing the brain and the right side showing the spinal cord which is a long thin cylindrical object with a pointed end. The spinal cord is located in the center of the head and is responsible for regulating the immune system. The image also includes text that explains that the site includes the eye and brain placenta and testis which are so-called because of mechanisms of immune-tolerance that operate to protect the tissues from immune-mediated damage. The central nervous system compressing the brain is essential for survival hence a balance between defense and damage caused by the brain in the skull. The image also mentions that the system does not permit excessive inflammation of immune cells.

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