Title: Digestive Health & The Small Intestine -- Jon Barron Newsletter
Headings: Anatomy Of The Small Intestine
Digestive Health | Natural Health Newsletter
Anatomy Of The Small Intestine
Macro anatomy of the small intestine
Duodenum
Jejunum
Ileum
Plicae circulares
Blood supply of the small intestine
The microstructure of the small intestine
Villi
Microstructure of a single villus
Ileocecal valve
Conclusion
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Content: That said, the primary role of the small intestine is the absorption of nutrients broken down by digestion. These include, the absorption of: Proteins (amino acids)
Carbohydrates (monosaccharides)
Fats (lipids)
Vitamins
Minerals
Enzymes
Water
Technically, the small intestine begins at the pylorus valve that separates the stomach from the duodenum and ends at the ileocecal valve that separates the ileum from the large intestine. The bulk of the small intestine is suspended from the body wall by an extension of the peritoneum called the mesentery. The small intestine is approximately 20-23 feet long, depending on how and when it’s measured, and it is divided into three sections: Duodenum
Jejunum
Ileum
Although precise boundaries between these three segments of bowel are not readily observed, there are microscopic structural differences among them. Duodenum
The name duodenum actually derives from its length and literally means “twelve” inches. It runs from the pylorus valve to the ligament of Treitz (a band of smooth muscle that extends to the diaphragm and works to hold the small intestine in place). Although technically part of the small intestine, the duodenum is almost 100% involved in digestion, not absorption. As such, we have discussed it in great detail already and will not focus on it in this newsletter.