| Subphrenic space | The area of the peritoneal cavity that lies directly below the diaphragm. |
| Peritoneal cavity | A potential space between the parietal and visceral peritoneum, housing many abdominal organs. |
| Supracolic compartment | The part of the peritoneal cavity above the transverse colon, containing the stomach and liver. |
| Infracolic compartment | The part of the peritoneal cavity below the transverse colon, extending into the pelvis. |
| Pelvis | The lower part of the torso, forming the basin of the spine and housing parts of the digestive and urogenital systems. |
| Stomach | A digestive organ that processes food by secreting acid and enzymes. |
| Transverse colon | The middle section of the large intestine, passing from right to left across the abdomen. |
| Third part of the duodenum | The horizontal section of the duodenum, the first part of the small intestine. |
| Superior mesenteric artery | A major artery that supplies blood to the small intestine and parts of the large intestine. |
| Lesser sac | The division of the peritoneal cavity behind the stomach. |
| Greater omentum | A large fatty structure attached to the stomach, draping over the intestines, with immunological functions. |
| Diaphragm | A large, dome-shaped muscle that separates the thoracic cavity from the abdominal cavity and plays a major role in breathing. |
| Liver | A vital organ involved in metabolism, detoxification, protein synthesis, and other essential bodily functions. |
| Aorta | The largest artery in the body, originating from the left ventricle of the heart and extending down to the abdomen where it branches off. |
| Visceral peritoneum | The inner layer of the peritoneum that surrounds the abdominal organs. |
| Parietal peritoneum | The outer layer of the peritoneum that lines the abdominal and pelvic cavities. |
| Mesentery | A fold of the peritoneal cavity that attaches the stomach, small intestine, pancreas, spleen, and other organs to the posterior wall of the abdomen. |
| Small intestine | A part of the gastrointestinal tract following the stomach and preceding the large intestine, where most of the end absorption of nutrients occurs. |
| Large intestine | The last part of the gastrointestinal tract, responsible for water absorption and feces formation. |
