22.3: The Peritoneum Last updated Jun 23, 2019 Save as PDF 22.2B: Gastrointestinal Reflex Pathways 22.3: The Peritoneum Page ID8015 ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy22.3: The PeritoneumThe peritoneum, the serous membrane that forms the lining of the abdominal cavity, covers most of the intra-abdominal organs.