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Welcome to The Visible Embryo, a comprehensive educational resource on human development from conception to birth.

The Visible Embryo provides visual references for changes in fetal development throughout pregnancy and can be navigated via fetal development or maternal changes.

The National Institutes of Child Health and Human Development awarded Phase I and Phase II Small Business Innovative Research Grants to develop The Visible Embryo. Initally designed to evaluate the internet as a teaching tool for first year medical students, The Visible Embryo is linked to over 600 educational institutions and is viewed by more than ' million visitors each month.


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Pregnancy Timeline by SemestersFemale Reproductive SystemFertilizationThe Appearance of SomitesFirst TrimesterSecond TrimesterThird TrimesterFetal liver is producing blood cellsHead may position into pelvisBrain convolutions beginFull TermWhite fat begins to be madeWhite fat begins to be madeHead may position into pelvisImmune system beginningImmune system beginningPeriod of rapid brain growthBrain convolutions beginLungs begin to produce surfactantSensory brain waves begin to activateSensory brain waves begin to activateInner Ear Bones HardenBone marrow starts making blood cellsBone marrow starts making blood cellsBrown fat surrounds lymphatic systemFetal sexual organs visibleFinger and toe prints appearFinger and toe prints appearHeartbeat can be detectedHeartbeat can be detectedBasic Brain Structure in PlaceThe Appearance of SomitesFirst Detectable Brain WavesA Four Chambered HeartBeginning Cerebral HemispheresEnd of Embryonic PeriodEnd of Embryonic PeriodFirst Thin Layer of Skin AppearsThird TrimesterDevelopmental Timeline
Click weeks 0 - 40 and follow fetal growth
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Home--History--Bibliography- -Pregnancy Timeline- Prescription Drugs/Pregnancy- Pregnancy Calculator - Reproductive System- -News Alerts

January 26, 2012--------News Archive Return to: News Alerts

Recent reports of the successful use of gene therapy to treat hemophilia B convinces
James Wilson, MD, PhD, to promote development of this technology.

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What Is Your BMI?

       

Prenatal Testosterone Linked to Language Delay in Male Infants

Males at greater than twice the risk of language delay than females

New research by Australian scientists reveals that males who are exposed to high levels of testosterone before birth are twice as likely to experience delays in language development compared to females. The research, published in Journal of Child Psychology and Psychiatry, focused on umbilical cord blood to explore the presence of testosterone when the language-related regions of a fetus' brain are undergoing a critical period of growth.

"An estimated 12% of toddlers experience significant delays in their language development," said lead author Professor Andrew Whitehouse from the University of Western Australia.

"While language development varies between individuals, males tend to develop later and at a slower rate than females."

The team believed this may be due to prenatal exposure to sex-steroids such as testosterone. Male fetuses are known to have 10 times the circulating levels of testosterone compared to females. The team proposed that higher levels of exposure to prenatal testosterone may increase the likelihood of language development delays.

Professor Whitehouse's team measured levels of testosterone in the umbilical cord blood of 767 newborns before examining their language ability at 1, 2 and 3-years of age.

The results showed male infants with high levels of testosterone in cord blood were between two-and-three times more likely to experience language delay. However, the opposite effect was found in female infants, where high-levels of testosterone in cord blood were associated with a decreased risk of language delay.

Previous smaller studies have explored the link between testosterone levels in amniotic fluid and language development. However, this is the first large population-based study to explore the relationship between umbilical cord blood and language delay in the first three years of life.

"Language delay is one of the most common reasons children are taken to a Paediatrician," concluded Professor Whitehouse. "Now these findings can help us to understand the biological mechanisms that may underpin language delay, as well as language development more generally."

Original article: http://www.eurekalert.org/pub_releases/2012-01/w-ptl012312.php