subperitoneally

Subperitoneally is an anatomical term used to describe a location beneath the peritoneum, the serous membrane that lines the abdominal and pelvic cavities and covers many organs. In human anatomy, tissues and spaces are commonly described as intraperitoneal, retroperitoneal, or subperitoneal. Subperitoneal structures lie directly under the peritoneal lining and can be part of extraperitoneal or preperitoneal compartments, with boundaries that vary by region.

In the abdomen and pelvis, the subperitoneal space refers to tissue located between the peritoneum and the underlying muscular, visceral, or pelvic structures. It is not a single closed cavity but a potential space containing connective tissue, fat, vessels, and nerves. Because of its loose organization, subperitoneal areas can accommodate fluid, pus, or blood during disease and can serve as pathways for the spread of infection or malignancy.

Clinically, subperitoneal planes are relevant during surgery and imaging. Surgeons may operate within subperitoneal compartments when accessing certain organs, while radiologists describe collections or masses that lie beneath the peritoneum. The term is descriptive and, in some contexts, may be used interchangeably with extraperitoneal or preperitoneal, though exact definitions can vary.

Etymology: from Latin sub- meaning under and peritoneum.