The cyclical variation in the percentage of ciliated cells in the normal human endometrium

The percentage of ciliated cells in the luminal and glandular epithelia of endometrial samples from sixty-eight normal women has been studied. Although the concentration of ciliated cells found in the luminal epithelium tended to lag behind and below those found in the glandular epithelium, no significant difference was found between the absolute percentages of ciliated cells in each site. The number of ciliated cells increased during the proliferative phase to reach a maximum of around 20%. This was maintained during the ovulatory phase, and then declined. The hormonal basis of this variation is discussed.