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Using the median plane (vertically) and the transumbilical plane (horizontally), the abdomen is divided into four quadrants:

  • Right Upper Quadrant (RUQ)
  • Left Upper Quadrant (LUQ)
  • Right Lower Quandrant (RLQ)
  • Left Lower Quandrant (LLQ)

Very briefly, some of the major structures/organs contained within each are:

  • RUQ = most of the liver, gallbladder
  • LUQ = spleen, most of the stomach
  • RLQ = appendix
  • LLQ = sigmoid colon
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