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There are two types of percussion: direct, which uses only one or two fingers, and indirect, which uses the middle/flexor finger. There are four types of percussion sounds: resonant, hyper-resonant, stony dull or dull. A dull sound indicates the presence of a solid mass under the surface. A more resonant sound indicates hollow, air-containing structures. As well as producing different notes which can be heard they also produce different sensations in the pleximeter finger.
Percussion was at first used to distinguish between empty and filled [[barrels]] of [[liquor]], and Dr. [[Leopold Auenbrugger]] is said to be the person who introduced the technique to modern medicine, although this method was used by [[Avicenna]] about 1000 years before that for medical practice such as using percussion over the stomach to show how full it is and to distinguish between [[ascites]] and [[tympanites]].<ref>{{cite web|url=
== Of the thorax ==
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