1. GUT PHYSIOLOGY Motility-II Dr. Jack Grider Rm 12-004 Sanger Hall
2009

2. Motility: Intestine
Three types of normal motility patterns in intestine
Peristalsis Segmentation

3. Motility: Intestine
Two types of abnormal motility patterns in intestine

4. Motility: Intestine
Two types of motility patterns predominate in the postprandial intestine: peristalsis (- - -) and segmentation (▼)

5. Motility: Intestinal Peristalsis

6. Motility: Intestinal Peristalsis
Peristalsis is a 2-component short arc reflex

7. Motility: Intestinal Peristalsis
Chemical & mechanical stimulation /
/Tk/NPY
(IPAN)
Distension
mucosa
(Extrinsic Afferent)
GABA/GRP
GABA/GRP
CGRP
Primary
afferent
orad
caudad

8. Motility: Intestinal Segmentation

9. Motility: Intestinal Segmentation

10. Motility: Intestinal Segmentation

11. Phase Phase II Phase III Phase I
Motility: Intestine
Interdigestive Motility
Phase Phase II Phase III Phase I
Myoelectrical
Activity
Contractile Activity

12. Motility: Intestine

13. Motility: Intestine
The simple motility patterns governed by short arc reflexes and
electrical activity are further modified by Long Arc Reflexes such as
the Intestino-Intestinal reflex. There are many others.

14. Motility: Intestine

15. Motility:Colon

16. Motility: Colon Mass Movement Or Giant Contractions Mixing Movements
Peristaltic & Antiperistaltic

17. Motility:Defecation Reflex

18. Motility: Defecation
Extracolonic muscles play an important role in defecation