_🔹THE CIRCLE OF WILLIS_ ▪️The circle of Willis is an important anatomical structure located at the base of the brain, formed by the anastomosis (connection) of several arteries. ▪️ It is supplied by the following arteries: _🔹AORTIC ARCH_ ▪️The aortic arch gives rise to the brachiocephalic artery, which then divides into the right common carotid artery and the right subclavian artery. _🔹BRACHIOCEPHALIC ARTERY_ ▪️The right common carotid artery ascends in the neck and branches into the internal carotid artery, which enters the skull and supplies the anterior portion of the brain. ▪️The right subclavian artery gives rise to the vertebral artery, which also enters the skull and contributes to the circle of Willis. _🔹INTERNAL CAROTID ARTERIES_ ▪️The internal carotid arteries, one from the right and one from the left, enter the skull and give rise to the anterior cerebral arteries and the middle cerebral arteries. _🔹VERTEBRAL ARTERIES_ ▪️The vertebral arteries, one from the right and one from the left,