Anomalies of mesenteric fixation may lead to abnormal openings through which internal hernias may occur.This is the likely mechanism of paraduodenal and supravesical hernias.

• 肠系膜的固定异常会导致异常的裂隙，从而产生腹内疝，这有可能就是十二指肠旁疝和膀胱上疝的发病机理。