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
Decline of Feudalism. The Decline of Feudalism. The Medieval Feudal system, feudalism, worked well for many hundreds of years. The decline of feudalism occurred due to a number of events which occurred during the Medieval era of the Middle Ages.