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.
Technically, one does not invade a city, once invades a country but captures a city. Hitler invaded France partly to gain revenge for Germany's defeat in World War I and also because he knew that Britain and France would try to stop him from his aim of conquering vast territories in Eastern Europe.Thus they had to be defeated first.hey DID get involved. Germany invaded Poland on 1st September 1939, so Britain and France declared war on Germany on 3rd September 1939. Britain & France were not able to sen â¦ d troops to Poland.