Distinguish between jejunum and ileum. 
Jejumun Ileum
1. Occupies upper and left part of the intestinal area.  1. Present in lower and right parts of intestinal area.
2. Walls of jejunum are thicker and more vascular. 2. Walls of ileum are thinner and less vascular.
3. Villi are large and abundant in jejunum. 3. Villi are shorter and less in ileum.
4. Lumen is wider and often empty. 4. Lumen of ileum is narrower and loaded.