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The average length of the menstrual cycle is 28—29 days, but this can vary between women and from one cycle to the next. The length of your menstrual cycle is calculated from the first day of your period to the day before your next period starts. Girls get their first period menarche , on average, between the ages of 11 and 14 years. By this stage, other sexual characteristics have developed, such as pubic hair and budding breasts. The menstrual cycle is complex and is controlled by many different glands and the hormones that these glands produce. A brain structure called the hypothalamus causes the nearby pituitary gland to produce certain chemicals, which prompt the ovaries to produce the sex hormones oestrogen and progesterone.
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All About Periods

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Egg Transport and Fertilization | GLOWM

Egg fertilization involves a complex sequence of events that starts with the release of a mature egg from the follicle, continues with the appearance of the two pronuclei after sperm entry, and is completed with the first mitotic division. Understanding the complexities of this process in humans has been limited to a large extent by ethical constraints. However, with the advent of assisted reproductive technologies ARTs , understanding of the various mechanisms involved in successful fertilization has been greatly enhanced. As ART has developed, so has our understanding of the essentials for human reproductive success. This chapter focuses on what is currently known about human egg transport and fertilization. Egg transport refers to the movement of the oocyte from the moment of expulsion from the ovarian follicle to entry into the distal segment of the fallopian tube before fertilization takes place. Once fertilized in the ampullary segment of the fallopian tube, the embryo spends about 5 days traveling into the remaining anatomical oviductal districts and arrives into the uterine cavity at the blastocyst stage.
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Your First Period

Usually about 2 years after your breasts begin to form, you will have your first menstrual period. Some girls get their first period as early as 9 or 10 years old, while others do not get it until later in their teens. You can still participate in sports and activities.
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Click Image to Enlarge. When a young woman reaches puberty, she starts to ovulate. This is when a mature egg or ovum is released from one of the ovaries. The ovaries are the two female reproductive organs found in the pelvis.
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