The wall of the fallopian tube includes an elaborately folded mucosa surrounded by a muscularis. The thickness of both layers varies along the length of the tube.
In the isthmus, shown here, the mucosa is relatively simple and the muscularis is quite thick. Contrast the image above with one of the ampulla, where elaborate mucosal folds occupy most of the potential lumenal space and the muscularis is relatively thin.
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Last updated: 4 April 2002 / dgk