Fig. 2From: Immune cells: potential carriers or agents for drug delivery to the central nervous systemThe structures of the blood-leptomeningeal barrier (a), blood-CSF barrier (b), and blood–brain barrier (c). This figure is a modification of Fig. 1 by Mastorakos et al. [6]. BBB blood–brain barrier, CNS central nervous system, CSF cerebrospinal fluidBack to article page