Summary
The morphological and topographical features of the intramural enteric nervous system in the small intestine of the pig has been studied on whole mounts by means of neuron-specific enolase (NSE) and S-100 protein immu-nohistochemistry. A clear visualization of the myenteric plexus allows the recognition of its characteristic morphology, including the thin tertiary plexus coursing within the smooth muscle layers. In the tela submucosa two ganglionated plexuses, each with its own specific characteristics, can clearly be demonstrated: (1) the plexus submucosus externus (Schabadasch) located near the inner surface of the circular muscle layer at the abluminal side of the submucosal vascular arcades, and (2) the plexus submucosus internus (Meissner) close to the outer surface of the lamina muscularis mucosae at the luminal side of the submucosal vascular arcades. Due to the possibility to trace clearly the perivascular plexuses of these vascular arcades by use of immunohistochemical techniques with antibodies to NSE and S-100 protein, the two submucosal nerve plexuses can be demonstrated with exceptional clarity. This is the first report of an investigation of the intramural nerve plexuses of the small intestine of the pig using the NSE and S-100 immunostaining methods, which is sufficiently detailed to substantiate the characteristic topography and structure of the two submucosal plexuses and their relation to the smooth muscle layers and perivascular plexuses. The level of NSE immunoreactivity for enteric neurons displays great variation, a substantial proportion of the type-II neurons appearing strongly stained. Although little is known of the specific function of these enzymes, proposals are discussed.
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Scheuermann, D.W., Stach, W., Timmermans, JP. et al. Neuron-specific enolase and S-100 protein immunohistochemistry for defining the structure and topographical relationship of the different enteric nerve plexuses in the small intestine of the pig. Cell Tissue Res. 256, 65–75 (1989). https://doi.org/10.1007/BF00224719
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DOI: https://doi.org/10.1007/BF00224719