Anatomy of the superior mesenteric blood vessels and their branches. The transverse colon is reflected upwards to reveal the superior mesenteric artery (red) and vein (blue). Tributaries of the inferior mesenteric vein drain part of the transverse colon and the descending colon. the small bowel and the ascending and transverse colon. Corresponding venous drainage is via the superior mesenteric vein leading to the portal vein and liver. From Sobotta, J. (1906) Atlas der deskriptiven Anatomie des Menschen. Vol 3, Das Nerven- und Gefasssystem des Menschen. J. F. Lehmann, Munchen, Fig 517.