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November 1972

The Vertebral Artery: Extracranial and Intracranial Structure

Author Affiliations

Manchester, England
From the Department of Neurology, Royal Infirmary, Manchester, England.

Arch Neurol. 1972;27(5):392-396. doi:10.1001/archneur.1972.00490170024004

As the vertebral artery enters the skull, its adventitia and media undergo a significant reduction in thickness, associated with gross diminution or total loss of elastic fibers in these two layers of the artery wall. This transformation is most marked in the last 0.5 cm extradurally, but is not complete until about 0.5 cm beyond the point of dural perforation.