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.
Germany violated the Treaty of Versailles by rebuilding their military. A part of the treaty was that Germany was not allowed to have a large military because of their aggress â¦ ive actions in WWI. They also violated the treaty by invading Poland on September 1, 1939.he Soviet Union did not wait for Hitler to break the Treaty of Versailles. Ever since the Treaty of Rapallo (1922) Germany had been allowed to maintain a secret army of 100,0 â¦ 00 men in the Soviet Union.