| 1
.
| Primary and secondary arterial arches |
| 2
.
| Pancreaticoduodenal vein (note that this vein receives branches which accompany the right branch of the middle colic artery, which in this specimen replaces the right colic artery) |
| 3
.
| Head of pancreas |
| 4
.
| Upper pointer: Ileal artery Lower pointer: Superior mesenteric plexus |
| 5
.
| Horizontal part of duodenum (covered by connective tissue) |
| 6
.
| Marginal artery (of Drummond) forming communication between middle colic and ileocolic arteries (right colic artery absent) |
| 7
.
| Ascending colon |
| 8
.
| Superior mesenteric lymph nodes |
| 9
.
| Ileum |
| 10
.
| Transverse colon (elevated) |
| 11
.
| Superior mesenteric plexus |
| 12
.
| Middle colic artery |
| 13
.
| Middle colic artery (left branch forming marginal artery) |
| 14
.
| Straight arteries |
| 15
.
| Filament of inferior mesenteric plexus |
| 16
.
| Duodenojejunal flexure |
| 17
.
| Marginal artery |
| 18
.
| Upper pointer: Middle colic vein Lower pointer: Superior mesenteric vein |
| 19
.
| Jejunal arteries |
| 20
.
| Jejunal vein |
| 21
.
| Descending colon |
| 22
.
| Jejunum |
| 23
.
| Inferior mesenteric plexus |
