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.
carotid bifurcation. the division of the common carotid artery into internal and external carotid arteries; it occurs at the level of the superior border of the thyroid cartilages (vertebral level C4), The carotid body and sinus occur in relation to the carotid bifurcation.Synonym(s): bifurcatio carotidis [TA].he division of the common carotid artery into internal and external carotid arteries; it occurs at the level of the superior border of the thyroid cartilages (vertebral level C4), The carotid body and sinus occur in relation to the carotid bifurcation. Synonym(s): bifurcatio carotidis [TA].