The document describes the structure and function of the small intestine. It is divided into three parts: the duodenum, jejunum, and ileum. The jejunum is wider in diameter, shorter, and has thicker walls than the ileum, which is narrower, longer, and has thinner walls. Both the jejunum and ileum receive blood vessels through arterial arcades and are connected to the abdominal wall by the mesentery, while lymphatics drain the small intestine.

1. Aim: to describe the structure and
function of this organ

2. Duodenum – bile duct and pancreatic duct
Jejunum
Ileum

4. Jejunum
Z Wider in diameter
Two-fifth (shorter)
Has thicker walls
Less Vessel Arcades
ileum
Z Narrower in diameter
Three-fifth (longer)
Has thinner walls
More Vessel Arcades

5. ArterialArcades
In
jejunum
In
ileum

8. Mesentery
Z a Double-layered
peritoneal fold
that connects both jejunum
& ileum to
the posterior Abdominal
wall

9. Lymphatics In Small intestine