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.
Most of Germany is on the east side of the Rhine River. A small part of Germany is west of the Rhine, and is called the Rhineland. The Rhineland is on the same side of the Riv â¦ er as France, which was why the French wanted it demilitarized after WWI. If the Germans were forbidden by the Peace Treaty to have military units stationed in the Rhineland, it would be harder for Germany to invade France again. 15 people found this useful.