Colon, Gross Anatomy

Description

Frontal torso anatomy is rendered in an x-ray style, with the thoracic cage and vertebral column semi-translucent overlying the abdominal viscera. The large intestine frames the small intestine, with the ascending colon positioned on the patient’s right, turning at the hepatic (right colic) flexure beneath the inferior margin of the liver, then continuing as the transverse colon to the left upper quadrant. At the splenic (left colic) flexure, the colon angles inferiorly into the descending colon on the patient’s left, continuing toward the sigmoid segment in the left iliac fossa, while central jejunoileal loops occupy the mid-abdomen. Spatially, the hepatic and splenic flexures are useful surface and imaging landmarks because they sit high and posterior relative to much of the abdominal bowel, tucked under the costal margins and adjacent to fixed retroperitoneal structures. This is where colonic pathology often declares itself on radiographs and CT: flexural angulation can accentuate large-bowel obstruction patterns, and the splenic flexure remains a classic watershed zone for ischemic colitis due to marginal arterial supply at the junction of SMA and IMA territories. Hard to miss. The overlay of ribs and spine also supports teaching about why upper-quadrant colonic pain can mimic hepatobiliary or splenic processes and why diaphragmatic irritation can refer discomfort to the shoulder. Use this artwork in gross anatomy and radiographic anatomy modules to orient learners to right versus left colonic geography, flexure nomenclature, and the way bowel contours relate to the bony thorax. It also suits gastroenterology and general surgery publications discussing large-bowel obstruction, ischemic colitis at Griffith’s point, or preoperative planning for right or left colectomy where mobilization of the hepatic and splenic flexures is a key step. Anatomical accuracy verified by SciePro's Medical Advisory Board.