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.
The internal carotid artery is major paired artery, one on each side of the head and neck, in human anatomy.he internal carotid artery is a terminal branch of the common carotid artery; it arises around the level of the third cervical vertebra when the common carotid bifurcates into this artery and its more superficial counterpart, the external carotid artery.