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Posterior Spinal Artery (Thoracic; Left)
Cardiovascular System

Posterior Spinal Artery (Thoracic; Left)

Arteria spinalis posterior

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Quick Facts

Origin: Vertebral artery.

Course: Descends in the posterolateral sulci of the spinal cord.

Branches: Pial plexus.

Supplied Structures: Posterior spinal cord.

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Origin

The posterior spinal arteries (two in number) arise either directly from the vertebral artery or from the posterior inferior cerebellar artery (a branch of the vertebral artery).

Course

The posterior spinal arteries descend in posterolateral sulci of the spinal cord.

Branches

The posterior spinal arteries contribute to the pial plexus. Additionally, they receive contributions from 10 to 23 posterior segmental medullary (radiculomedullary) arteries (Jones et al., 2013).

Supplied Structures

The posterior spinal arteries supply the remaining dorsal gray and white columns and peripheral parts of the lateral and ventral white columns (Standring, 2020).

List of Clinical Correlates

- Spinal cord ischemia

References

Jones, H. R., Burns, T., Aminoff, M. J. and Pomeroy, S. (2013) The Netter Collection of Medical Illustrations: Nervous System, Volume 7, Part 1 - Brain e-Book. Elsevier Health Sciences.

Standring, S. (2020) Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd edn.: Elsevier Health Sciences.

Learn more about this topic from other Elsevier products

Posterior Spinal Artery

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The posterior spinal arteries are paired discontinuous arteries that arise from the vertebral arteries and run medial to the dorsal root entry zone.

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