The abdomen is divided into nine regions, which are used as a standard anatomical reference to describe the location of organs and structures within the abdominal cavity. The nine abdominal regions are:
1. Right hypochondriac region: This region is located on the right upper side of the abdomen, just below the ribs. Organs found in this region include the liver, gallbladder, and part of the right kidney.
2. Epigastric region: Situated in the upper middle portion of the abdomen, between the right and left hypochondriac regions. Organs in this region include the stomach, pancreas, liver, and part of the duodenum.
3. Left hypochondriac region: Similar to the right hypochondriac region, this region is located on the left upper side of the abdomen, beneath the ribs. Organs found here include the spleen, part of the stomach, and part of the left kidney.
4. Right lumbar region: Positioned on the right side of the abdomen, in the middle section. Organs found in this region include the ascending colon (part of the large intestine), part of the liver, and part of the small intestine.
5. Umbilical region: Located in the central part of the abdomen, surrounding the umbilicus (belly button). Organs found here include the small intestine, transverse colon (part of the large intestine), and the duodenum.
6. Left lumbar region: Similar to the right lumbar region, this region is located on the left side of the abdomen, in the middle section. Organs found here include the descending colon (part of the large intestine), part of the small intestine, and part of the left kidney.
7. Right iliac (inguinal) region: Positioned on the right lower side of the abdomen. Organs found here include the cecum (the beginning of the large intestine), appendix, and part of the small intestine.
8. Hypogastric (pubic) region: Situated in the lower central part of the abdomen. Organs found here include the bladder, uterus (in females), and part of the small intestine.
9. Left iliac (inguinal) region: Similar to the right iliac region, this region is located on the left lower side of the abdomen. Organs found here include the sigmoid colon (part of the large intestine), part of the small intestine, and the left ureter.
Please note that while these regions provide a general reference for organ location, the exact position of organs may vary slightly among individuals. Additionally, some organs may span across multiple regions or extend beyond the boundaries of these regions.