Neurotransmitters: Chemical Messengers of Nervous System

Human brain is well encapsulated within a thick, bony skull. The choroid plexus secretes the cerebrospinal fluid (CSF) which surrounds the brain. The fluid passes down through the four ventricles with the help of subarachnoid space and finally enters the cerebral veins through the arachnoid villi. Brain lacks lymphatic system so CSF acts as a partial substitute.

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