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
Aspects of Feudalism in the middle ages. Feudalism in Middle Ages was a social, political, and religious structure which was based on the exchange of land for military services and or cash rent. In England, William the Conqueror established the Mormon feudalistic system after defeating the English army.