The sigmoid mesocolon is a peritoneal fold attaching the sigmoid colon to the pelvic wall.The apex is divided near the left common iliac artery and serves as a potential site for an internal hernia.

• 乙状结肠系膜是固定乙状结肠到骨盆壁的腹膜皱襞，其尖端在接近左侧髂总动脉处分叉，成为潜在的腹内疝的部位。