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Rectospinal neurons: cell bodies, pathways, immunocytochemistry and ultrastructure
W L Neuhuber1, M Appelt, J M Polak
1Institute of Anatomy, University of Zürich, Switzerland.
Neuroscience
|September 1, 1993
Summary
Researchers discovered novel rectospinal neurons in rats, directly connecting the rectal wall to the spinal cord. These distinct enteric neurons, identified via tracing and microscopy, suggest a direct pathway for gut-brain communication.
Area of Science:
- Neuroscience
- Gastroenterology
- Anatomy
Background:
- The enteric nervous system (ENS) traditionally functions autonomously.
- Limited understanding exists regarding direct neural connections between the distal rectum and the central nervous system (CNS).
Purpose of the Study:
- To investigate a novel class of neurons projecting from the rectal wall to the spinal cord in rats.
- To characterize the anatomical location, projection pathways, and neurochemical properties of these rectospinal neurons.
Main Methods:
- Combined retrograde neuronal tracing, immunocytochemistry, and electron microscopy in rat models.
- Injections into specific spinal cord segments (L6/S1) and dorsal/ventral rhizotomy.
- Immunostaining for various peptides (VIP, CGRP) and proteins (calbindin, NF, peripherin).
Main Results:
- Identified rectospinal neurons predominantly in myenteric ganglia of the distal rectum.
- Demonstrated projection to spinal cord segments L6/S1 primarily via dorsal roots.
- Found selective expression of VIP, CGRP, calbindin, neurofilament protein, and peripherin.
- Observed synaptic contacts on rectospinal neurons, indicating potential CNS integration.
Conclusions:
- Established rectospinal neurons as a distinct anatomical and neurochemical class of enteric neurons.
- These neurons provide a direct link from the distal gut to the spinal cord.
- Suggests reciprocal communication between the enteric and central nervous systems.