The juxtaglomerular apparatus and zona glomerulosa were studied histologically in rabbits during the whole pregnancy period. The granularity of the kidney juxtaglomerular cells diminishes up to 25 days at which time it reaches control values. After delivery, the juxtaglomerular index increases significantly and rises above control values. The width of the adrenal zona glomerulosa is smaller in the first half of pregnancy in comparison with controls. In the second half it rises significantly. After delivery it greatly surpasses control values.

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