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
This page is primarily about the classic, or medieval, Western European form of feudalism. For feudalism as practiced in other societies, as well as that of the Europeans, see Examples of feudalism.Feudalism was a combination of legal and military customs in medieval Europe that flourished between the 9th and 15th centuries.utside a European context, the concept of feudalism is often used only by analogy (called semi-feudal), most often in discussions of feudal Japan under the shoguns and sometimes medieval and Gondarine Ethiopia.