[Brain barriers. Part II. Blood/cerebrospinal fluid barrier and cerebrospinal fluid /brain tissue barrier].

Brain has its own unique and effective protection system that controls the process of active transport of chemical substances from blood to neurons and cerebrospinal fluid. The above mentioned system is called the blood brain barrier. As far as morphology is concerned the barrier consists of several membranes isolating the following compartments of the intracranial space: brain tissues, blood and cerebrospinal fluids. One of those membranes-blood/brain tissues barrier, has been described in the first part of this work. Structure and function of the blood/CSF barrier and CSF/brain tissues barrier are described in the second part.