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24 Cards in this Set

  • Front
  • Back
What are the 3 parts of the small intestine?
Duodenum, Jejunum, and Ileum.
What is the major site for iron absorption in the small intestine?
What is the major site for absorption of folic acid in the small intestine?
Where is the important site for absorption of vitamin B12 and bile salts in the small intestine?
Where are Brunner's glands found?
In the submucosa, initial portion of the duodenum.
What do Brunner's glands secrete and why?
Alkaline mucous to bring intestinal contents to optimal pH for pancreatic enzymes.
What do the villi look like in the duodenum as compared to the ileum?
The duodenum villi are "leaf-like", while the ileum villi are "finger-like".
What are Plicae Circulares?
Permanent folds of mucosa and submucosa.
Although found in all areas of the small intestine, plicae circulares is best developed in which section?
Jejunum, characteristic feature.
What can be found in the epithelial layer of the mucosa in the small intestine?
Simple columnar epithelium composed of Goblet cells and microvilli (brush boarder).
Lymphoid nodules and lacteal can be found in which sub layer of the mucosa?
Lamina propria
What can be found between the villi in the lamina propria of the small intestine?
Intestinal glands, or crypts
What are the characteristics of absorptive cells?
Tall columnar cells with apical membrane containing striated brush boarder of densely packed microvilli.
Goblet cells increase in number from ________ to _________.
Duodenum to Ileum
What are M cells?
Apical surface has many small folds, no microvilli, thought to function as an APC.
Where are Paneth's cells located?
Bases of crypts
How can you recognize a Paneth's cell?
Recognized by large bright (acidophilic) granules.
What is the role of Paneth's cells?
To continuously secrete lysozyme, and enzyme to digest bacterial cell walls.
What to APUD cells produce?
Low-molecular weight polypeptides
Where are undifferentiated stem cells located?
Near Crypt base
What is found in the submucosa of the small intestine?
DICT, Peyer's patches, Brunner's glands
What 2 muscle layers are found in the muscularis externa?
Well developed Inner circular and outer longitudinal layers.
What is the external covering of the Jejunum and Ileum?
What is the external covering of the Duodenum?
Both serosa and adventitia