The distribution and fine structure were studied of the following 3 peptide-containing fibers of enteric origin, vasoactive intestinal polypeptide (VIP), bombesin (BOM) and cholecystokinin (CCK)-like immunoreactive peptide in the celiac-superior mesenteric ganglion complex (CMG) of the guinea pig. These peptides, especially VIP, were distributed more densely on the mesenteric side than on the celiac side of the CMG, and their distribution shared a similar mosaic pattern. Immunoelectron microscopic analysis revealed that the fibers formed synaptic contacts with the proximal dendrites of the principal ganglion cells, however, the profiles of these synaptic junctions differed between fibers. Those containing VIP or CCK formed symmetrical synapses, while those containing BOM formed assymetrical ones. This suggests that there are some functional differences between these enterofugal fibers in the CMG. © 1989.
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