Jejunal and Ileal Veins, Posterior View

Description

Oriented from a posterior abdominal perspective, the jejunum and ileum occupy the central field as convoluted small-bowel loops suspended by the mesentery, with blue jejunal and ileal veins coursing proximally toward the superior mesenteric vein. Multiple straight venous radicles (vasa recta) pass from the intestinal wall through the mesenteric fat to reach arcading tributaries, running alongside the corresponding jejunal and ileal arteries before converging medially. Posterior midline landmarks such as the abdominal aorta and inferior vena cava frame the mesenteric root, while the kidneys sit superiorly and laterally with ureters descending toward the pelvic bladder. Posterior visualization of the superior mesenteric venous drainage helps clarify why small-bowel pathology can present with mesenteric congestion and why venous anatomy matters during operative mobilization of the small intestine. In acute mesenteric venous thrombosis, clot propagation within jejunal or ileal veins and into the superior mesenteric vein can lead to bowel wall edema, hemorrhagic infarction, and portal venous gas, findings that are interpreted on contrast-enhanced CT by tracking these venous channels back to their confluence. The arcades and long vasa recta also underline a key teaching point: jejunal loops typically show fewer arterial arcades with longer straight vessels than the ileum, a distinction that parallels their venous pattern and aids orientation in the mesentery. Surgical anatomy courses, radiology teaching files, and GI pathology chapters can use this plate to anchor discussions of mesenteric venous thrombosis, small-bowel ischemia, and venous variants encountered in colectomy or small-bowel resection near the mesenteric root. It also suits patient-facing material on intestinal blood flow when paired with CT angiography or venography panels. Anatomical accuracy verified by SciePro's Medical Advisory Board.