Support of endothelial cells which form the blood-brain barrier a major role in the repair and scarring process of the brain and spinal cord following mechanical inflammatory injuries. The blood-brain barrier is comprised by blood vessel endothelial cells where as the blood-CSF barrier is formed primarily between the choroid plexus epithelial cells. Associate Degree Nursing Physiology Review Nervous System Anatomy Physiology Human Anatomy And Physiology Because the plexus capillary endothelial cells unlike other capillaries in the brain are devoid of tight junctions they are more permeable to macromolecules 3. . An alternative hypothesis is that cells cross the placental barrier by mechanisms akin to the active adhesion and transmigration that occurs across high endothelial venule HEV endothelium in peripheral lymph nodes and at the blood-brain barrier BBB. Dopamine DA a contraction of 34-dihydroxyphenethylamine is a neuromodulatory molecu...