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The human abdomen is divided into regions by anatomists and physicians for purposes of study, diagnosis, and therapy. In the four-region scheme, four quadrants allow localisation of pain and tenderness, scars, lumps, and other items of interest, narrowing in on which organs and tissues may be involved. The quadrants are referred to as the left lower quadrant, left upper quadrant, right upper quadrant and right lower quadrant, as follows. The left lower quadrant (LLQ) of the human abdomen is the area left of the midline and below the umbilicus. The LLQ includes the left iliac fossa and half of the left flank region. The term is not used in comparative anatomy, since most other animals do not stand erect. The equivalent term for animals is left posterior quadrant. The left upper quadrant (LUQ) extends from the median plane to the left of the patient, and from the umbilical plane to the left ribcage. The equivalent term for animals is 'left anterior quadrant'. The right upper quadrant (RUQ) extends from the median plane to the right of the patient, and from the umbilical plane to the right ribcage. The equivalent term for animals is 'right anterior quadrant'. The right lower quadrant (RLQ) extends from the median plane to the right of the patient, and from the umbilical plane to the right inguinal ligament. The equivalent term for animals is 'right posterior quadrant'. == Important organs == Of LLQ: * descending colon * sigmoid colon * Left ovary and Fallopian tube * Left ureter Of LUQ: *Stomach *Spleen *Left lobe of liver *Body of pancreas *Left kidney and adrenal gland *Splenic flexure of colon *Parts of transverse and descending colon Of RUQ: * Liver * Gall bladder with biliary tree * Duodenum * Head of pancreas * Right kidney and adrenal gland * Hepatic flexure of colon Of RLQ: *Cecum *Appendix *Ascending Colon *Right ovary and Fallopian tube *Right ureter 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Quadrant (abdomen)」の詳細全文を読む スポンサード リンク
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