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.
The Berlin Wall was a border security installation built by the German Democratic Republic (GDR) on August 12, 1961. Officially called the Antifaschistischer Schutzwall (anti-fascist protection dike), the wall was to protect the GDR from aggressive acts by the West.hus, these three sectors, which comprised West Berlin, became an island surrounded by East German (GDR) territory. The Wall dissected eight train lines, four underground train lines and 193 major and minor roads. In total, the wall measured 97 miles.