Plexus on the Middle Colic, Right Colic, and Ileocolic Arteries, Posterior View

Description

Running along the posterior aspect of the transverse mesocolon, a fine perivascular plexus is traced on the middle colic artery as it courses toward the transverse colon, then continues inferiorly along the right colic and ileocolic arteries supplying the hepatic flexure, ascending colon, and cecal region. Branching arcades lie close to the colic wall, while the arterial trunks sit more centrally within the mesentery, accompanied by their neurovascular sheaths. Haustra and omental appendices mark the colonic surface, and the fan-shaped mesocolon anchors the vessels and nerves to the posterior abdominal wall. Orientation is posterior, with the right colon positioned to the viewer’s right and the transverse colon spanning superiorly. A posterior view of these colic vessels matters because it matches the surgical plane in right colectomy and extended right hemicolectomy, where the middle colic pedicle and its relationship to the superior mesenteric vessels dictate both lymphadenectomy and safe ligation. Autonomic fibers traveling with the middle colic, right colic, and ileocolic arteries contribute to postoperative motility changes and visceral pain patterns when divided or irritated. Small variations are common, including an absent right colic artery or a shared trunk with the ileocolic, and a perivascular plexus helps explain why dissection close to the arterial adventitia behaves differently than mobilization along the mesocolic fascia. Clean landmarks. Real consequences. Use this artwork in abdominal anatomy and GI surgery teaching, colorectal oncology texts discussing complete mesocolic excision, and clinical modules on SMA branch anatomy, right-sided ischemic colitis, and iatrogenic autonomic injury during central vascular ligation. Anatomical accuracy verified by SciePro's Medical Advisory Board.