Extraperitoneal fascia (also: endoabdominal fascia, or subperitoneal fascia) is a fascial plane - consisting mostly of loose areolar connective tissue - situated between the fascial linings of the walls of the abdominal and pelvic cavities (transversalis fascia, anterior layer of thoracolumbar fascia, iliac fascia, and psoas fascia) externally, and the parietal peritoneum internally. Its quality and quantity is varies considerably. It occupies the extraperitoneal space.
