Answer:
Uterine Cycle
The early proliferative phase of the uterine cycle begins at the end of menstrual flow. The uterine glands in this phase are sparse and relatively small, and the epithelial cells develop microvilli and cilia under the influence of estrogen. The late proliferative phase reveals an increased thickness of the stratum functionalis, and the glands are more coiled and densely packed. The secretory phase of the uterine cycle begins at ovulation. In this phase, the glands become even more complexly coiled and the endometrial lining reaches its maximal thickness, whereas the stratum basalis and myometrium remain relatively unchanged. Note the saw-toothed appearance of the glands.
