The most common organism in spinal infection is from the bacteria Staphylococcus aureus which typically exists on human skin, followed by Escherichia coli. Most spine infections occur in the lumbar spine because of the blood supply to this region of the spine.
Feudalism, a system of political and military relationships, evolved in western Europe. The feudal system was a simple but effective means of medieval government in which the king rented land to barons, who provided him knights and taxes
Origins of the idea. 1  The terms feudalism and feudal system were generally applied to the early and central Middle Agesâthe period from the 5th century, when central political authority in the Western empire disappeared, to the 12th century, when kingdoms began to emerge as effective centralized units of government.