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Lecture notes

Motility of the Small and Large Intestines

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Starts off with the motility of the small intestine, explaining the 2 main mechanisms, with definitions and what they entail. Then goes onto the reflexes that are involved in the small intestine motility, it includes diagrams which makes it easier to understand. Then goes onto explain motility in t...

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  • July 26, 2023
  • 3
  • 2020/2021
  • Lecture notes
  • Dr sarah bailey
  • All classes

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Gastrointestinal Tract
Motility Small Intestine and Large Intestine Motility


• Intestinal slow waves: Segmentation and peristalsis
• Regional motility
• Ileocecal sphincter




• Periods of segmentation are followed by brief period of peristalsis allowing:

i. INTERSPACED MOVEMENT - propulsion then mixing/distribution to
facilitate optimal digestion and absorption

ii. (up to 12/min in duodenum and upper jejunum to ~8/min at the terminal
ileum)


• BOTH CAN BE ALTERED BY ENS, AUTONOMIC NERVOUS SYSTEM, HORMONES




• SEGMENTATION = main pattern of SI in the small intestine
• Is TRIGGERED by PACEMAKER - rhythm will vary in the region of SI- there are more food bolus in duodenum
than ileum - all motility is much reduced




• FREQUENCY GRADIENT of RHYTHMIC CONTRACTIONS in the SI promotes aboral propulsion of the intestinal
chyme
• DISTENSION = primary STIMULUS via enteric nervous system




Integration of Physiological Systems Page 1

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