why? because you will not get drunk if you just ate grapes supposedly you have to drink its juice or the grape wines if you want to get drunk.
here is your answer
the human brain is the central organ of the human nervous system, and with the spinal cord makes up the central nervous system. the brain consists of the cerebrum, the brainstem and the cerebellum.
system: central nervous system; neuroimmune system
vein: internal jugular vein, internal cerebral veins; external veins: (superior, middle,
artery: internal carotid arteries, vertebral arteries