AbstractThis report compares the arterial supply of the lumbo‐sacral spinal cord in the monkey with that of man. The arterial supply to the lumbo‐sacral cord of 100 monkeys (82 Rhesus and 18 Mangabey) was demonstrated by perfusion techniques. We tabulated the level and side of origin of the great anterior medullary artery. Previous authors have shown that in man the peak incidence of the great anterior medullary artery is at T‐10. The peak incidence in the monkey is at L‐1. There are other features of the arterial supply to the lumbo‐sacral cord of the monkey that are different