Small Intestine Anatomy

1. SMALL INTESTINE
Dr. Mrinal N Rudragoudar
Asst Professor Dept Of Kriya Sharir
SMVVS RKM AMC & RESEARCH
CENTER
Email-drmnr1991@gmail.com
Mobile -9036632670
10/11/2022 1

2. Introduction
• Part of GIT extending between pyloric
sphincter & ileocecal valve.
• Small diameter.
• 6 m.
• Maximum absorption.
10/11/2022 2

3. parts
10/11/2022 3

4. Villi
10/11/2022 4

5. 10/11/2022 5

6. Glands
10/11/2022 6

7. • Argentaffin cell/ enterochromaffin cells:
intrinsic factor of castle.
• Goblet cells: mucus.
• Paneth cells: cytokines
• Brunner glands : additional gland, first part of
duodenum, mucus glands.
10/11/2022 7

8. properties
• Volume : 1800 ml/ day
• Reaction: alkaline
• pH : 8.3
10/11/2022 8

9. Composition
10/11/2022 9

10. Functions SE
• Digestive
• Protective( defensins , intestinal ulcers)
• Activator(trypsin)
• Hematopoietic( intrinsic factor of castle)
• Hydrolytic(enzymatic reaction)
10/11/2022 10

11. 10/11/2022 11

12. Functions of SI
• Mechanical
• Secretory
• Hormonal(seretinin, CCK )
• Digestive
• Activator
• Hematopoietic
• Hydrolytic
• Absorption
10/11/2022 12

13. Regulation
• Nervous :parasympathetic & sympathetic
(vasodilation & vasoconstriction ). Some local
nerve reflexes.
• Hormonal: enterocrinin, cholecystokinin
10/11/2022 13

14. Applied
• Malabsorption
• malabsorbtion syndrome
• Crohn’s diseases
• Steatorrhea
• Celiac diseases
10/11/2022 14

15. 10/11/2022 15

16. 10/11/2022 16

17. 10/11/2022 17