[Systematization of the angioarchietectomy of the jejunum and the ileum in man around the perinatal period (author's transl)].

Abstract

The vascularization of the different layers of the jejunum and the ileum was studied in 35 human intestins between the 23d foetal week and the first postnatal year. The vascular systems in all 35 cases were injected with gelatinous inda ink. During the perinatal period the submucosal layer is a true vascular crossroad formed by an intricate plexus of blood vessels, both arterial and venous, similar in structure and whose density increases with the development of the intestinal wall. The vascularization of the muscularis, essentially a tributary of the submucosal layer, is assured by long and short muscular arteries whose structure and number vary with age. The venous system of the muscularis is a satellite of the arterial system. The arteries of the serosa originate essentially from straight arteries and accessorily from the intervascular mesenteric arches. Their terminal and collateral branches form an anastomotic network caracteristic of the perinatal period. Drainage is assumed by veins of the serosa, which are tributaries of straight veins, and similar to the arteries, undergo progressive densification parallel with development. The arteries of the mucosa are tributaries of the submucosal network and abandon precapillary arterioles and two capillary networks: one surrounds the Lieberkühn glands, the other is destined for the intestinal villus. These dense networks and the vascular networks of the other layers help preserve the intstinal villus and glands during development. Finally, the venous drainage of the mucosa flows into the submucosal venous network.