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Related Experiment Videos

Rhythmic oscillating complex: characterization, induction, and relationship to MMC in chickens

M Jimenez1, V Martinez, A Rodriguez-Membrilla

  • 1Department of Cell Biology and Physiology, Veterinary Faculty, Universitat Autónoma de Barcelona, Bellaterra, Spain.

The American Journal of Physiology
|April 1, 1994
PubMed
Summary

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Migrating myoelectrical complexes (MMCs) and rhythmic oscillating complexes (ROCs) were studied in chickens. ROCs, a novel pattern of intestinal contractions, were observed in fasted animals, distinct from MMCs.

Area of Science:

  • Gastroenterology
  • Comparative Physiology
  • Electromyography

Background:

  • Migrating myoelectrical complexes (MMCs) are crucial for intestinal motility.
  • Rhythmic oscillating complexes (ROCs) represent a distinct myoelectrical pattern in the avian gastrointestinal tract.

Purpose of the Study:

  • To investigate and characterize the myoelectrical activity of MMCs and ROCs in chickens.
  • To explore the relationship between MMCs, ROCs, and gastrointestinal coordination.

Main Methods:

  • Chronic electrode implantation in the chicken gastrointestinal tract (stomach to rectum).
  • Electromyographic recording of myoelectrical activity in fed and fasted states.
  • Pharmacological and surgical interventions (vagotomy, drug administration) to assess ROC induction and regulation.

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Main Results:

  • MMCs (phases I-III) were observed in the jejunum and ileum.
  • ROCs occurred spontaneously in fasted chickens, particularly during the dark period, exhibiting unique orad and aborad contraction patterns.
  • ROCs disrupted normal gastroduodenal coordination and were not induced by apomorphine or cholecystokinin, but were observed after vagotomy.

Conclusions:

  • ROCs represent a distinct intestinal myoelectrical pattern in chickens, differing from MMCs.
  • ROCs share similarities with mammalian retrograde giant contractions but have different origins and induction mechanisms.
  • Further research is needed to elucidate the precise physiological role and regulatory pathways of ROCs.