The CSF fills the space that surrounds the brain, and wastes from inside the brain make their way out to the CSF, which gets dumped, along with  the waste, into the blood.
O LCR preenche o espaço  que rodeia o cérebro. Os resíduos do interior do cérebro escoam para o LCR que despeja para o sangue,  juntamente com os resíduos.