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Spinal Branch of Posterior Intercostal Artery
Cardiovascular System

Spinal Branch of Posterior Intercostal Artery

Ramus spinalis arteriae intercostalis posterioris

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Origin

Each dorsal branch of the posterior intercostal arteries gives rise to a spinal branch before dividing into medial and lateral cutaneous branches.

Course

The spinal branch enters the intervertebral foramen, accompanying a thoracic spinal nerve.

Branches

The spinal branch of the posterior intercostal artery gives rise to prelaminar, radicular, and postcentral branches.

Supplied Structures

The spinal branches of the posterior intercostal arteries supply the thoracic vertebrae, the periphery of the intervertebral discs, as well as the adjacent dura and epidural tissue. The small radicular arteries supply the anterior and posterior roots of the spinal cord (including the spinal, or dorsal root, ganglion). When the radicular arteries are enlarged (segmental medullary arteries), they contribute to the anterior and posterior spinal arteries, which supply the spinal cord (Standring, 2020).

References

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

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