Digestive movements within the stomach


Digestive movements within the stomach


Muscular movements inside the stomach during digestion depend on the volume and located of the chyme.

  1. Slow peristalsis waves are started after few minutes of entering the food in the stomach through lower oesophageal orifice. These waves mix the food in the pacemaker cells of smooth muscles present in the fundus and body of the stomach. The pacemaker cells generate peristalsis movements at the rate of 3-4 per minute that push the food towards the pyloric sphincter. This peristalsis movement is called the basic electrical rhythm (BER) of the stomach. This rhythmic peristalsis produces chyme that goes towards the pyloric region. 
  2. As soon as the pyloric regions starts being filled, powerful peristalsis waves churn the chyme into simper forms and pump (push) them towards the pyloric orifice carrying through pyloric canal or antrum. With each of the waves, few ml of chyme is pumped in the duodenum of small intestine in the forms of small drops by pyloric orifice. This orifice is very small, so most of the chyme is come back in the pyloric region so that it could be churned again by peristalsis waves. The action of pumping the chyme through pyloric sphincter is called pyloric pump.
  3. As soon as the stomach is being emptied, peristalsis waves move towards the body of the stomach and pump all the chyme in the pyloric region.