Which of the following is not a quadrant of the abdomen?

The medial quadrant is not recognized as one of the standard quadrants of the abdomen. The abdomen is typically divided into four quadrants: the right upper quadrant, the right lower quadrant, the left upper quadrant, and the left lower quadrant. This quadrantal division is a standardized method that aids in the assessment and localization of abdominal pain, injuries, and other medical conditions.

The other options—right upper quadrant, lower left quadrant, and left lower quadrant—are all accepted as correct anatomical divisions used by healthcare professionals for examination and treatment. Understanding these divisions is crucial for effective diagnosis and communication regarding abdominal issues.