The two posterior spinal arteries originate from the Posterior inferior cerebellar arteries (PICA).
a) The posterior spinal arteries originate from the anterior cerebral arteries
b) The posterior spinal arteries originate from the coronary arteries
c) The posterior spinal arteries originate from the vertebral arteries
d) The posterior spinal arteries originate from the Posterior inferior cerebellar arteries (PICA)
