If you are planning a hard-to-get Alcatraz tour, you will need to really layer clothes for a variety of temperatures. The weather varies greatly from month to month and hour to hour. Even the neighborhood youre in makes a difference. For many visitors, the San Francisco weather can be counter-intuitive.
The carotid arteries are major blood vessels in the neck that supply blood to the brain, neck, and face. There are two carotid arteries, one on the right and one on the left. In the neck, each carotid artery branches into two divisions: 1  The internal carotid artery supplies blood to the brain.
Internal Carotid Artery. The internal carotid artery is one of the two arterial branches that stems from the common carotid artery. The carotid artery arises both directly and indirectly from the arch of the aorta, depending on which side of the body it belongs to.tenosis of the carotid arteries, which include both the common carotid as well as the internal and external branches, is most commonly caused by a pathological disorder known as arteriosclerosis.