This is the very first act of regeneration of the functional layer. All cells used in rebuilding come from basal layer of endometrium. Stimulated by estrogen. See Marieb for more information. Estrogen causes endometrial cells to exhibit receptors for progesterone.
Progesterone causes stromal cells to store glycogen, conn.
Multiple neuronal centers in limbic system transmit impulses to arcuate nucleus, etc. Pulses cause fluctuation of LH but not nearly as much for FSH FSH Small glycoprotein secreted by gonadotrophs of anterior pit. Induces antrum formation, has no affect prior to this stage of follicle development. Estrogen promotes development of FSH receptors on granulosa cells. FSH and LH necessary for estrogen secretion Promotes estrogen secretion by stimulating granulosa cells to convert testosterone into estrogens.