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Variations in Cell and Structure Populations along the Length of Murine Small Intestine

Previous workers have reported a range of structural variations occurring along the length of small intestine. These studies have concentrated on the major intestinal components with little information available on the intersite variation of other members of a highly heterogeneous population. Using resin histology, the current study has collected data per circumference for all definable structural features within the murine intestinal wall, along with measurements for epithelial, muscle, nerve and connective tissue areas, and villous height and cryptal depth. Seven different sites along the length of the small intestine were examined. Following statistical comparisons a number of features exhibited no intersite variation; these were numbers of villi, submucosal vessels, myenteric nerve plexus profiles, inner muscle nuclei and apoptotic bodies as well as measurements for tissue areas and cryptal depth. Variations were seen between sites for crypts, enterocytes, villous and cryptal stromal cells, cryptal goblet cells, cryptal non-secretory epithelial cells, Paneth cells, endocrine cells, intra-epithelial lymphocytes, submucosal nerve plexus profiles, outer muscle nuclei and mitotic figures. A reduced villous height was observed caudally. Certain correlations between villous height/crypt number and constituent parameters have been noted. The results provide a complete description of how each definable structural feature within the gut wall varies at regular intervals along the length of the small intestine in C57 BL mice. A number of previously unreported variations have been described. The work provides a comprehensive data bank for future intestinal investigations.