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Endometrium. This image is a section through the endometrium of the uterus in the secretory (luteal, progestational) phase of the menstrual cycle. In this phase, the endometrium is being prepared to receive a developing embryo. The lumen of the uterus is to the right. Note that in this phase of the menstrual cycle that glands are much elongated to the surface. They become tortuous in appearance and begin their secretory activity.