Collagen and Elastin in the Normal Fetal Bladder

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Abstract
The development of muscle, collagen and elastic fibers was studied histologically in 15 human fetal bladder specimens. Muscle thickness progressively increased and the relative collagen content in the muscle decreased during gestation. The ratio of thick-to-thin collagen fibers also decreased, whereas elastic fibers increased. These findings document the normal process of maturation of the fetal bladder and serve as a basis for comparison with congenitally obstructed fetal bladders.