Picture of Abdomen. The abdominal cavity is the part of the body that houses the stomach, liver, pancreas, kidneys, gallbladder, spleen, and the large and small intestines. The diaphragm marks the top of the abdomen and the horizontal line at the level of the top of the pelvis marks the bottom.
Anatomy of the stomach area. Several key organs are packed closely with the stomach in the abdominal cavity, including the liver, whose smaller left lobe is located superior to the stomach and whose large right lobe occupies the same space in the upper-right quadrant as the stomach and left lobe combined.
The muscles of the abdomen protect vital organs underneath and provide structure for the spine. These muscles help the body bend at the waist. The major muscles of the abdomen include the rectus abdominis in front, the external obliques at the sides, and the latissimus dorsi muscles in the back.