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Abstract
The common carotid artery is a large bilateral vessel supplying head and neck; it ascends to just above the level of the thyroid cartilage’s upper border, where it divides into an external carotid, supplying the exterior of the head, face and most of the neck, and an internal carotid, supplying the cranial and orbital contents.
The right common carotid artery (CCA), exclusively cervical, normally arises from the brachiocephalic trunk immediately behind the right sternoclavicualr joint. It is shorter than the left CCA which originates directly from the aortic arch, immediately posterolateral to the brachiocephalic trunk and therefore has both thoracic and cervical parts (Approximately 9.5cm versus 14cm respect-tively). The normal CCA gives no angiographically detectable branches. Thus its caliber (approximately 8mm) remains constant during its entire course.