Changes

* However, in the CNS capillary endothelial cells are very tightly packed.

* However, in the CNS capillary endothelial cells are very tightly packed.

** This density of cells restricts passage of substances out of the bloodstream much more than endothelial cells in capillaries elsewhere in the body.

** This density of cells restricts passage of substances out of the bloodstream much more than endothelial cells in capillaries elsewhere in the body.

*** This is the basis of the [[Blood Brain Barrier (BBB)|blood brain barrier]]

*** This is the basis of the [[Blood Brain Barrier - Anatomy & Physiology|blood brain barrier]]

 

==Structure and Function==

==Structure and Function==