NORMAL ANATOMY
The CNS of a vertebrate develops in the embryo from the dorsal,hollow nerve cord.in the initial stage,nerve cord is simply a tube filled with CSF. Much of the brain is supplied blood by the internal carotid arteries.
The internal carotid arteries branch at the base of the brain in an area called the circle of Willis.
PART NO 3
A blood clot (thrombus) may form in the body, break-off, and travel to the brain through a carotid artery and the circle of Willis.
PART NO 4
The blood clot may block the passage of blood through a brain artery, depriving nearby tissue of oxygen and nutrients. The result is a stroke
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