The unpaired anterior spinal artery occupies the anterior median fissure of the spinal cord and sends branches through the pia to supply the cord (Fig. 15). The anterior spinal artery is formed superiorly within the vertebral canal by anterior contributions from the left and right vertebral arteries just before the latter join to form the basilar artery (Fig. 19). The paired posterior spinal arteries are also formed superiorly in the vertebral canal by posterior branches of either the vertebral arteries or the posteroinferior cerebellar arteries. The posterior spinal arteries are smaller than the anterior spinal artery and take a position along the line of attachment of the posterior rootlets of the spinal nerve.
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