![]() Sometimes, however, the spinal segmental arteries also give off segmental medullary arteries which directly feed into the anterior spinal artery and posterior spinal arteries, however, the numbers differ between person to person. ![]() Theoretically there should be 31 radicular arteries for each foramen that receives an artery, but in reality, there is always less. Not only can they supply the ASA/PSA but also provide blood supply to the nerve roots along which they track. The segmental arteries then bifurcate into an anterior and posterior radicular artery which feed into both anterior and posterior spinal arteries respectively. These additional arteries are called segmental spinal arteries. The anterior spinal artery and PSA are fed additional arteries throughout their course down the spinal cord at each spinal level through the intervertebral foramen. The ASA provides blood to the anterior two-thirds of the spinal cord, and the PSA delivers blood to the posterior one-third of the spinal cord. The posterior spinal arteries can branch off the posterior inferior cerebellar artery (PICA) or branches from the pre-atlantal vertebral arteries which also travel caudally down the spinal cord but through the two posterior sulci. However, before joining together to become the basilar artery, the vertebral arteries each give off a branch which becomes the anterior spinal artery the anterior spinal artery travels caudally down the spinal cord through the anterior sulcus. The vertebral arteries pass through the transverse foramen of C1 through C6 and through the foramen magnum to become the basilar artery. The anterior spinal artery is formed by the vertebral arteries which originate from the first part of the subclavian artery. The main blood supply to the spinal cord is via the single anterior spinal artery (ASA) and the two posterior spinal arteries (PSA). The vertebral blood supply for the spinal cord comes from many different sources in the body depending on the region.
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