The site for nutrient digestion and absorbtion
Anatomy:
Pyloric sphincter
Duodenum
------- Trietz Ligament
Jejunum
Ileum
Structural Aspects, Secretions, and Digestive Processes of the Small Intestines
Cell types and secretions:
- Enterocytes: glyocalyx - coat the villi, hydrolyze carbs and proteins
- Unstirred water/fluid layer between enterocytes and brush border
- Stem cells in Crypts of Lieberkuhn
- Paneth cells - antimicrobial peptide (defensins), lyzozymes
- Goblet cells - cysteine rich proteins with antifungal activity, and mucos
- Brunner's glands - in submucosa, mucous producing
- Exocrine glands pancrea- bicarb
Regulation of Intestinal Motility and Secretions
VIP + intestinal motility
Glucagon - intestinal motility
Peristaltic waves: 11-12/min
Neural reflexes coordinates
Migrating motility or myoelectric complex (MMC) - weak contractions betwee meals.
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