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How does the left common carotid artery begin?

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Detailed anatomical illustration of the human thyroid gland and surrounding structures, showing the right and left lobes, isthmus, nearby arteries, veins, nerves, lymph nodes, and cartilage in the neck. — thyroid gland Human thyroid gland.

The left common carotid artery originates directly from the arch of the aorta located over the heart. This distinguishes it from the right common carotid artery, which arises from the brachiocephalic trunk.12