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Endometrium. This image is a section through the endometrium of the uterus in the proliferative (follicular, estrogenic) phase of the menstrual cycle. The lumen of the uterus is to the right. The black line indicates the approximate division of the endometrium from the underlying myometrium. The luminal portion of the endometrium is called stratum functionalis while the deeper portion is referred to as stratum basalis, which tends to have a somewhat darker staining appearance. The red line indicates the approximate division between the two strata. The wavy clear spaces are the uterine glands (red arrows). The stratum functionalis, which sloughs during menstruation, is in the process of regenerating during this proliferative period