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segmental medullary arteries


Definition: a large caliber spinal or radicular artery that courses centrally along the posterior or anterior root of a spinal nerve, supplying it and the surrounding meninges in the fashion of any spinal/radicular artery, but then continues on to reach and anastomose with the anterior or posterior (longitudinal) spinal artery. Only 4–9 of the spinal or radicular arteries are medullary spinal arteries, found mainly in the lower cervical, lower thoracic, and upper lumbar levels, the largest of which is the segmental medullary artery.

Synonym(s): arteriae medullares segmentalesTA, medullary spinal arteries

See Also: great segmental medullary artery, spinal arteries, (anterior and posterior) radicular arteries

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.