Related Experiment Videos
Correlated functional and structural analysis of enteric neural circuits
J B Furness1, J C Bornstein, T K Smith
1Centre for Neuroscience, Flinders University Medical School, Bedford Park, Australia.
Archives of Histology and Cytology
|January 1, 1989
Summary
The enteric nervous system (ENS) controls gut functions. New research identifies specific sensory and motor neurons in the guinea-pig small intestine, detailing their roles in motility and secretion.
Area of Science:
- Neuroscience
- Gastroenterology
- Physiology
Background:
- The enteric nervous system (ENS) regulates intestinal functions like motility, secretion, and blood flow.
- Recent advancements have improved understanding of ENS neuron types and circuitry.
- Identifying specific neuron types involved in gut reflexes remains a challenge.
Purpose of the Study:
- To provide an integrated functional and structural description of ENS nerve circuits.
- To identify primary sensory neurons and final motor neurons controlling intestinal motility.
- To elucidate the neural circuits underlying secretomotor reflexes.
Main Methods:
- Electrophysiological characterization of enteric neurons.
- Morphological analysis using Dogiel classifications.
- Investigation of neural pathways in the guinea-pig small intestine.
Main Results:
- Primary sensory neurons in the guinea-pig small intestine exhibit Dogiel type II morphology and AH electrophysiological properties.
- These sensory neurons connect to myenteric ganglia and originate from the mucosa.
- S neurons, identified as Dogiel type I, are motor neurons controlling circular muscle, with processes extending circumferentially.
- Secretomotor neurons, located in submucous ganglia, regulate water and electrolyte transport.
- Sympathetic neurons modulate secretomotor neuron excitability to maintain homeostasis.
Conclusions:
- Specific sensory (Dogiel type II, AH) and motor (S, Dogiel type I) neurons have been identified in the guinea-pig small intestine's motility control.
- The neural circuitry for secretomotor reflexes has been partially elucidated, with sympathetic regulation impacting water and electrolyte homeostasis.