Endocrinology of reproduction half of pregnancy, progesterone and prolactin prepare the mammary glands for lactation. Estrogens and progesterone promote mammary epithelial cell proliferation resulting in the formation of the primary and secondary ductal structure. Progesterone induces formation of tertiary side-branches in the mammary glands during puberty and during the luteal phase of the menstrual cycle upon which lobuloalveolar structures form under the influence of prolactin. Prolactin stimulates lactogenesis. hCG appears to be soporific during pregnancy; levels of hCG correlate with sleep changes during pregnancy, and administration of hCG increases sleep in rats likely via neuronal LHCGR. Endocrinology of reproduction Hormonal regulation occurs at
Menstrual extraction internationally. This method, another type of manual vacuum aspiration, is most often called menstrual regulation. As with ME, menstrual regulation, when desired as a method of controlling fertility, is performed very early in the menstrual cycle, earlier than a pregnancy test can be performed. One main difference between these two methods is the equipment used. While the Del Em was created such that one is able to put it together from individual pieces and it consists of three parts: the cannula with a one-way valve, a collection jar and the syringe, which are connected by plastic tubing; menstrual regulation is