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
In the 19th century the adjective feudal evolved into a noun: feudalism. The term feudalism is recent, first appearing in French in 1823, Italian in 1827, English in 1839, and in German in the second half of the 19th century. The term feudal or feodal is derived from the medieval Latin word feodum.