ileum. Lower villus height (Khambualai et al., 2009) and
narrower cell area (Incharoen and Yamauchi, 2009) were
observed in the ileum compared with the jejunum.
These morphological features of the ileum might be
hypothetically explained as related to digested nutrients
already been absorbed in the upper portion of the small
intestine, which results in nutrient-poor contents arriving
to the ileal lumen. Therefore, the ileum does not