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These planes divide the abdomen into nine regions right and left hypochondriac regions, epigastric region, umbilical region, right and left lateral regions of abdomen, hypogastric region, and right and left inguinal regions. The second horizontal plane is the intertubercular plane, which passes through the tubercles of the iliac crest and the body of the fifth lumbar vertebra. The first horizontal plane is the subcostal plane which runs at the level of the lower edge of the 10th costal cartilage. The vertical planes are the left and right midclavicular lines that pass from the middle of the clavicle downwards to the middle of the inguinal ligament. The most common way to divide the abdomen is by using two vertical and two horizontal planes. Right inguinal - hypogastrium - left inguinal Right hipochondrium - epigastrium - left hipochondrium Principle: two vertical midclavicular lines (left and right) cross two horizontal: subcostal (through lower edge of 10th costal cartilage) and transtubercular (through tubercles of iliac crests) -> nine segments: right and left hypochondrium, epigastrium, right and left lumbar regions, umbilical region, right and left inguinal regions, hypogastrium

Principle: vertical line through linea alba (median plane) crosses horizontal line through the umbilicus (transumbilical plane) -> four quadrants: right upper quadrant (RUQ), right lower quadrant (RLQ), left upper quadrant (LUQ), left lower quadrant (LLQ) This article will discuss both schemes and include a list of the internal organs and other important anatomical structures that can be found within each region. There are two main forms of categorization, the first which is simpler and is mapped out by dividing the abdomen into four quadrants, while the second method divides it into nine segments.Įither of these two ideas about the abdominal regions are internationally recognized and can be used on a daily basis during clinical practice. It is simply up to the physician on how they wish to present their findings. The regions of the abdomen are theoretical divisions used by clinicians to help localize, identify and diagnose a patients symptoms.