Ileum extends distally from the jejunum. It ends at the ileocecal junction.

Arteries:

Veins:

Nerves:

 

Comparison between jejunum and ileum with reference to ileum

  • Ileum is about 3.5 cm in diameter; hence it is smaller in diameter than the jejunum, which is about 4 cm in diameter.

  • It is thinner walled

  • It is less red and therefore less vascularized

  • Its mesentery has a several arterial arcades (2-5) with short branches.

  • Its villi are smaller

  • Its circular folds are smaller

  • Aggregated lymphatic follicles (Peyer’s patches)are numerous in the ileal mucosa.

  • Circular folds can be felt through the wall of the jejunum like a shirt sleeve under a coat

  • Jejunum lies in the hypogastric or suporapubic region

  • Mesentery of ileum is thinner walled

  • Mesentery of ileum has less fat.

Relations of the ileum

It is related anteriorly to the anterior abdominal wall, with the lesser omentum intervening. Posteriorly it lies on the posterior parietal peritoneum and all retroperitoneal structures.

 

 

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