This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Vascular surgery, Subject name: Surgery
After doing a graft repair of a thoraco-abdominal aneurysm, the patients developed weakness. Most propable cause for this: 
Select and explain. 
A. Decreased blood supply to the lower limbs, B. Thoraco splanchnic injury, C. Discontinuation of aeria radicularis magna, D. Lumbosacral nerve injury
C: Discontinuation of aeria radicularis magna
Answer: C: Discontinuation of aeria radicularis magna 
Explanation: Aeria Radicularis Magna: Aeria radicularis magna (aery of Adamkiewicz) is the main source of blood supply to the anterior spinal aery in the thoracolumbar segment of the spinal cord. It arises from either one of the lower posterior intercostal aeries (T9-T11) or of the subcoastal aery (T12), or less frequently of the upper lumbar aeries (L1 and L2) Occlusion or interruption is one of the major reasons for spinal cord ischemia (leading to paraparesis/Paraplegia) during surgery for thoracoabdominal aneurysm. Ref: Sabiston 20th edition Pgno: 1788