Tympanomastoid surgery is needed for the chronic draining ear or in the case of a cholesteatoma. This surgery involves the middle ear space as well as the mastoid and usually the incision may be through the tympanic membrane (eardrum) or behind the ear. 1 = Mastoid Bone 2 = Middle Ear 3 = Tympanic membrane (eardrum).his surgery involves the middle ear space as well as the mastoid and usually the incision may be through the tympanic membrane (eardrum) or behind the ear. 1 = Mastoid Bone 2 = Middle Ear 3 = Tympanic membrane (eardrum).
After WW1, they built the Maginot Line, along their border with Germany. This was a massive defensive fortifiations with underground bunkers that could be used for troops and support and command and control. In 1940, the Germans defeated this defensive line by attacking through Belgium and going around it.
Since World War Two, Chamberlain's negotiations at Munich are identified with appeasement, as Chamberlain could have stood up to Hitler. Supposedly, if he had stood up to Hitler's demand, Hitler would have backed down, and World War Two would have been avoided.This is not supported by the facts.fter World War I, the Rhineland, the German area west of the Rhine, was to be demilitarized. In 1936, gambling boldly, Hitler marched German troops into the Rhineland. These were green troops, without heavy equipment, and Hitler strained his support with this move.