Blood-brain barrier, or in medical term (BBB) range of separator between the liquid's brain cell in the central nervous system and the flow of blood circulation in the body, it is as if the colored substances within the blood injected can be observed that of this substance within the brain, the trace cannot be seen. The curtain or barrier of the capillaries, a special form is unlike the structure of normal in the capillaries, pores, usual not and the connection between cellular in them of the type of connection is sturdy, and is the result of many molecules, and small molecules and also bacteria to be able to traverse it(through ) and reach the cerebrospinal fluid in the brain. Mutually the level of endothelial the capillaries of the protein, particularly, that by them the arrival of glucose to the brain as nutrition possible. Also the exchange of gas (oxygen - carbon dioxide) between blood circulation and brain of the dam, no problem.