Abstract
✓ The direction of blood flow in the cervical spinal cord of monkeys was studied by direct cinematic observation of the results of dye injections, plus separate angiographic studies. The studies indicated that in monkeys blood enters the cervical spinal cord mainly from radicular arteries that are usually derived from branches of the costo-cervical trunk. Although some blood entering at the low cervical level flows toward the thoracic cord, the major component flows up to the C-2 level. The findings cast doubt on the established assumption that the vertebral arteries provide the main blood supply of the cervical cord.
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