Identify microscopically:

1. Mucosa

2. Submucosa

3. M. externa

4. Serosa

Draw and annotate:

A line sketch where the villi and crypts of Lieberkühn as well as glands of Brunner are shown in detail.

1. What are the projections and invaginations from the surface of the small intestine called?
2. What types of cells cover the luminal surface of the duodenum?
3. What types of cells line the crypts?
4. What type of gland is the Brunner gland?
5. Where do the Brunner glands open?

• Fig 40-001
• Fig 40-002
• Fig 40-003
• Fig 40-004
• Fig 40-005
• Fig 40-006