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Additional resources for The Reproductive System (Your Body, How It Works)

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2). This phase can be the most variable in length, lasting anywhere from 10 days to three weeks. Day 1 of the menstrual cycle is identified as the first day of menstruation. This point was chosen because it is an easily monitored physical sign. Menses, when the endometrial lining of the uterus is sloughed off as the menstrual flow, is the first phase of the uterine cycle and lasts on the average of 4–5 days. q 62 12/20/06 11:23 AM Page 62 THE REPRODUCTIVE SYSTEM The sloughing of the uterine lining occurs in response to the decline of progesterone and estrogen that is necessary for the maintenance of the uterine lining.

These individuals are sterile. In these individuals, estrogen receptors function normally. At puberty, the estrogen generated from excess androgens initiate the development of the secondary sex characteristics in a female direction. q 34 12/20/06 11:12 AM Page 34 THE REPRODUCTIVE SYSTEM highly vascular tissues that contain condensed Leydig cells and solid seminiferous cords. The cords contain Sertoli cells and the future germ cells, spermatogonia. The seminiferous cords develop into the seminiferous tubules where sperm are produced, requiring the development of a pathway for the release of the sperm.

In Chapter 2, you read how the ovaries develop and that all of the oocytes (eggs) that the ovary will ever contain are produced before birth. In the first 3–5 weeks of fetal life, approximately 2,000 germ cells migrate to the genital ridges. These stem cells, now called oogonia, invade the cortex of the developing ovary and start proliferating by active mitosis. By week 8 postconception, their number has increased to approximately 600,000. Between 8–13 weeks, some of the oogonia stop mitosis and begin the first meiotic division.

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