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.
Prior to invading Poland, Germany had made a deal with the Soviet Union. After Poland was defeated, the country was divided up between Germany and the Soviet Union. Even though France and Great Britain declared war on Germany in 1939, there wasn't a lot of fighting at first. It was in April of 1940 when Germany went on the attack again. On April 9, 1940 Germany invaded Norway and Denmark. Soon after that, they invaded the Netherlands, Belgium, and France.