The phrase "upper quadrant" refers to the top section or area of something. It often signifies a specific part of the body located in the upper section, such as the upper abdomen or the upper right or left section of the belly. Full definition
The gallbladder is a small pear shaped organ nestled under the liver in the right upper quadrant of the abdominal cavity. (colonzone.org)
When I listen to the heart with my stethoscope, I can detect abnormal sounds on the left upper quadrant of the heart — the area where this valve is located. (2ndchance.info)
8) Which of the following is located beneath the diaphragm in the left upper quadrant of the abdominal cavity? (aama-ntl.org)