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Differences in nitrergic innervation of the developing chick cloaca and colorectum
A M O'Donnell1, J Bannigan, P Puri
1The Children's Research Centre, Our Lady's Hospital for Sick Children, Crumlin, Ireland.
Pediatric Surgery International
|December 6, 2005
Summary
The embryonic cloaca exhibits sparser enteric nervous system innervation compared to the colorectum, with distinct developmental patterns in nitrergic neurons. Further analysis of cloacal innervation is needed.
Area of Science:
- Developmental biology
- Neuroscience
- Gastroenterology
Background:
- The developing gut's intrinsic innervation is crucial for function.
- The enteric nervous system (ENS) innervates the entire gastrointestinal tract, including the cloaca.
- Nitregic neurons are a significant component of the ENS, offering insights into its development.
Purpose of the Study:
- To investigate and compare the development of nitregic innervation in the embryonic chick cloaca and colorectum.
- To analyze the distribution and density of nitregic neurons in these developing gut regions.
Main Methods:
- Tissue specimens from chick embryos at embryonic days 11, 15, and 19 were collected.
- NADPH-diaphorase (NADPH-d) histochemistry was performed on whole mount preparations.
- Quantitative analysis of ganglia density, nitregic cell number per ganglia, and cell size was conducted.
Main Results:
- The colorectum displayed a significantly denser network of nitregic innervation than the cloaca at embryonic days 11 and 15.
- Ganglia density decreased with age in both regions.
- Nitregic cell number per ganglia varied significantly throughout development in both the cloaca and colorectum.
- Total cell size was comparable between regions and increased with development, primarily due to cytoplasmic expansion.
Conclusions:
- Striking differences exist in the nitregic innervation patterns between the embryonic chick cloaca and colorectum.
- The sparser innervation of the cloaca suggests region-specific developmental trajectories within the embryonic gut.
- These findings underscore the necessity for detailed investigation into the ENS development within the embryonic cloaca.
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