Posted by Anonymous on Thursday, June 21, 2012 at 4:45pm.
Have you looked up the unfamiliar words?
http://dictionary.reference.com/browse/tympanum
Sometimes pictures help.
http://www.google.com/search?q=tympanum&hl=en&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=vpHjT_H1KoOc8QSyz5iGCA&ved=0CGoQsAQ&biw=711&bih=453
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