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4. Blood and Nerve Supply

Blood reaches the thymus from the internal thoracic artery and the superior and inferior thyroid arteries. It drains through the left innominate vein, as well as the inferior, middle, and superior thyroid veins. Several arteries enter the thymus, forming the blood-thymus barrier in the cortex. The thymus’ nerve supply comes from the vagus nerves and the sympathetic nervous system.

doctor chest imaging Egor Kulinich / Getty Images

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