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The arterial arcades (intermesenteric arterial anastomoses or Riolan arcades) are loops of arteries around the jejunum and ileum. Nearest the duodenum the mesenteric loops are primary, the vasa recta are long and regular in distribution, and the translucent spaces (lunettes) are extensive. Toward the ileocolic junction, secondary and tertiary loops are observed, the vessels are smaller and become obscured by numerous fat-tabs. The diagrams below show the arrangement and variations of the loops of the mesenteric vessels for various segments of the small intestine of average length: ==Additional images== File:Intestinal arteries.JPG|Arterial arcades File:Arterial arcades.JPG|Arterial arcades File:Gray1065.png|Loop of small intestine showing distribution of intestinal arteries File:Gray1066.png|Loop of small intestine showing distribution of intestinal arteries File:Gray1067.png|Loop of small intestine showing distribution of intestinal arteries File:Gray1068.png|Loop of small intestine showing distribution of intestinal arteries File:Gray1069.png|Loop of small intestine showing distribution of intestinal arteries File:Gray1070.png|Loop of small intestine showing distribution of intestinal arteries 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Arterial arcades」の詳細全文を読む スポンサード リンク
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