What's the biological name for the part of the body that contains the stomach, intestines, liver, spleen, and pancreas?

The region of the body located between the thorax (chest) and the pelvis is known anatomically as the abdomen. This large, muscularly walled space forms the abdominal cavity, which houses a host of vital organs responsible for digestion, metabolism, and filtering waste. Its upper boundary is the diaphragm, a powerful muscle that aids in breathing, while its lower boundary is the pelvic inlet. The more common, informal term for this area is the belly or tummy.

Unlike the heart and lungs, which are shielded by the rigid rib cage, the organs of the abdomen are relatively unprotected by bone. Instead, they are encased and supported by layers of muscle, such as the rectus abdominis, which forms the "six-pack." This anatomical design allows for the necessary expansion and movement required for breathing, digestion, and pregnancy, but it also leaves the organs within more vulnerable to injury.

To better locate pain or describe medical conditions, healthcare professionals often mentally divide the abdomen into four quadrants: right upper, left upper, right lower, and left lower. The term "abdomen" itself has an interesting origin, derived from the Latin word *abdere*, meaning "to hide." This is a fitting name for the body part that conceals so many of our essential, hardworking internal organs from view.