Abstract
NADPH-diaphorase (NADPH-d) was used as a marker for neuronal nitric oxide synthase in order to investigate the nitrergic neurons of the developing myenteric ganglia on whole-mount preparations in the proximal and distal segments of the small intestine and in the colon of the chicken embryo, between incubation days 12 and 19. Neurons that were positive for NADPH-d were counted in randomly selected myenteric ganglia. The data obtained from each area and each age group were subjected to two-way analysis of variance (ANOVA) and the Student–Newman–Keuls test. Between incubation days 12 and 19, the originally narrow-meshed myenteric plexus with its high ganglionic density progressively became wide-meshed and the ganglionic density decreased significantly. Quantitative analysis further revealed a significant decrease in the NADPH-d-positive nerve cell density with age. At the same time, the constant or even increasing number of nitrergic cells per ganglion may indicate that the decreasing cell density may be a result of the growth of the bowel with decreasing ganglion density rather than a decrease in the total number of myenteric nitrergic cells. Regional differences in the dynamics of the quantitative changes were revealed. A significant decrease in the nitrergic cell number appeared earlier in the proximal than in the distal segments of the small intestine or in the colon. In contrast, the significant decline of the ganglionic density was first noticed in the colon at the same time.
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Bagyánszki, M., Román, V. & Fekete, É. Quantitative Distribution of NADPH-diaphorase-positive Myenteric Neurons in Different Segments of the Developing Chicken Small Intestine and Colon. Histochem J 32, 679–684 (2000). https://doi.org/10.1023/A:1004167416731
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DOI: https://doi.org/10.1023/A:1004167416731