Ileum

Slide 41

The following five figures demonstrate the different structures of the ileum.

Clinical Case

A 25-year old male student presents with fever, abdominal pain, diarrhea and complains of fatigue. He also says that he has lost weight. Physical examination reveals right lower quadrant tenderness with a fullness reflecting adherent loops of the small bowel. A laparotomy showed the appearance of the terminal ileum to be hyperemic and boggy, with mesentery and mesenteric lymph nodes swollen and reddened, although the bowel wall was pliable. A diagnosis of Crohn's disease is made. What are the layers of the small intestine? Which epithelial cells are present in the epithelial layer of the mucosa? What cells are present in the crypts of Lieberkuhn and what role do they play? What is characteristic of the lymph follicles of the small bowel and what are they called? How does the ileum differ histologically from the duodenum?

Microscopy

This is a very low magnification of a section through the ileum demonstrating the different layers and structures. Fig 41-001

This preparation is a higher magnification of the ileum demonstrating structures of the mucosa. Fig 41-002

This is a very high magnification of the ileum epithelium. Fig 41-003

A very high magnification of the outer layers of the ileum. Fig 41-004

This figure is a high magnification of a Peyer's patch in the ileum. Fig 41-005

Memorandum
Clinical Case	Fig 41-001	Fig 41-002
Fig 41-003	Fig 41-004	Fig 41-005