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The mesosigmoid is a double right and left-bladed membrane consisting of two serous, polygon-shaped, epithelial-celled layers one on each side, while the middle layer, the essential one, is the membrana mesenterii propria, the real neuro-vascular visceral pedicle. In the membrana mesenterii propria are arranged in definite order the nerves, lymphatics, the arcs and arcades of vessels and the elastic and fibrous tissue bundles which surround and retain in fixed relations the essential structures which maintain the existence of the S—romanum. The nerves which supply the mesosigmoid chiefly arise: 1, from the abdominal brain; 2, from the ganglion at the bifurcation of the aorta, close to the origin of the inferior mesenteric artery; and 3, from nerves arising out of the lumbar plexus. The inferior mesenteric artery conveys the blood to the mesosigmoidea. The shape of the mesosigmoidea in the adult is very various. It is an unequally S—shaped loop in
ROBINSON B. PERITONEAL SUPPORTS—(LIGAMENTUM PERITONEI.). JAMA. 1896;XXVI(11):522–524. doi:10.1001/jama.1896.02430630024002j
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