[The endometrium of the immature rabbit stimulated by an estrogen and treated with a progestogen. Scanning electron microscopy study].

The endometrium of rabbits, treated by the usual pharmacology methods designed for the measurement of the pseudogestagen effect, was studied by scanning electron microscopy. Estrogen stimulation was followed by a multiplication of the number of ciliated cells. Treatment with progesterone lead to a decrease in the numbers of microvilli and to the appearance of rounded bulges which increased in numbers as the progesterone dose level increased. These changes were quite close to those observed in post menopausal women under estro-progestogen treatment.