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Common carotid artery
In anatomy, the left and right common carotid arteries (〔''OED'' 2nd edition, 1989.〕〔(Entry "carotid" ) in ''(Merriam-Webster Online Dictionary )''.〕) are arteries that supply the head and neck with oxygenated blood; they divide in the neck to form the external and internal carotid arteries.〔Ashrafian H. Anatomically specific clinical examination of the carotid arterial tree. Anat Sci Int. 2007 Mar;82(1):16–23.〕
== Structure ==
The common carotid artery is present on the left and right sides of the body. These arteries originate from different arteries, but follow symmetrical sources. The right common carotid originates in the neck from the brachiocephalic trunk; the left from the aortic arch in the thorax. These split into the external and internal carotid arteries at the upper border of the thyroid cartilage, at around the level of the fourth cervical vertebra.
The left common carotid artery can be thought of as having two parts: a thoracic (chest) part and a cervical (neck) part. The right common carotid originates in or close to the neck, so contains only a small thoracic portion. There are studies in the bioengineering literature that have looked into characterizing the geometric structure of the common carotid artery from both qualitative and mathematical (quantitative) standpoints.〔
The average diameters of the common carotids in adult males and females are 6.5 mm and 6.1 mm respectively.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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