Welcome to The Visible Embryo

Home- - -History-- -Bibliography- -Pregnancy Timeline- --Prescription Drugs in Pregnancy- -- Pregnancy Calculator- --Female Reproductive System- News Alerts -Contact

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.


WHO International Clinical Trials Registry Platform
The World Health Organization (WHO) has created a new Web site to help researchers, doctors and patients obtain reliable information on high-quality clinical trials. Now you can go to one website and search all registers to identify clinical trial research underway around the world!



Home

History

Bibliography

Pregnancy Timeline

Prescription Drug Effects on Pregnancy

Pregnancy Calculator

Female Reproductive System

Contact The Visible Embryo

News Alerts Archive

Disclaimer: The Visible Embryo web site is provided for your general information only. The information contained on this site should not be treated as a substitute for medical, legal or other professional advice. Neither is The Visible Embryo responsible or liable for the contents of any websites of third parties which are listed on this site.
Content protected under a Creative Commons License.

No dirivative works may be made or used for commercial purposes.

Return To Top Of Page
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
Google Search artcles published since 2007
 
November 25, 2011--------News Archive

Women at Low Risk Can Safely Choose Birth Style
Women with low risk pregnancies should be able to choose where they give birth, concludes The Birthplace in England national prospective cohort study.

Finger (Mal)formation Function of Desert DNA
Explaining the diversity of leg shapes in the animal kingdom and hereditary defects in finger formation.

Key Molecular Switch for Telomere Extension Found
For the first time, a key target for DNA damage is found that must be chemically modified to enable an enzyme thought to play a key role in cancer and aging.

New Role for Gene in Maintaining Steady Weight
Findings may help combat obesity and diabetes.

November 24, 2011--------News Archive

New Facts About Stuttering
Some forms of persistent stuttering are caused by mutations in a gene governing the recycling of old cell parts - not speech.

Preventing Preemie Brain Injury
New advances could eventually help reduce the number of premature babies who develop cerebral palsy, epilepsy or behavioral disorders such as ADHD.

Short Stature May Be Due To a 'Shortage' of Genes
Research suggests that uncommon genetic deletions are associated with short stature.

November 23, 2011--------News Archive

Intestinal Disorder, Preemies and AB Blood Type
Preemies with the AB blood type who develop NEC are nearly three times as likely to die from it as preemies with other blood types.

Babies Fed Fish Before 9 Months Wheeze Less
But pre-natal pain and fever antibiotics taken by mom in pregnancy, or by the baby in the first-week of life, increase risk of "pre-school wheeze."

Physical Activity Improves Quality Of Sleep
People sleep significantly better and feel more alert during the day if they get at least 150 minutes of exercise a week, a new study concludes.

November 22, 2011--------News Archive

Critical Molecules For Hearing/Balance Discovered
Gene-therapy trial will attempt to restore hearing in deaf mice.

Tweaking One Gene Makes Muscles Twice As Strong
Salk scientists and their collaborators find new avenue for treating muscle degeneration in people who can't exercise.

Fruit Fly Intestine Holds Secret to Fountain of Youth
Long-lived fruit flies offer Salk scientists clues to slowing human aging and fighting disease.

November 21, 2011--------News Archive

Nerve Cells Key to making Sense of All of Our Senses
Scientists have unraveled how the brain manages to process complex, rapidly changing, and often conflicting sensory signals and make sense of our world.

Discovery of A New Muscle Repair Gene
Thanks to next-generation DNA sequencing, an international team of scientists have discovered more about the function of muscle stem cells.

Immune System Governs Stem Cell Regeneration
Controlling a stem cell transplant recipient’s immune response may be major key to successful bone regeneration.

WHO Child Growth Charts

The human brain is bombarded with a cacophony of information from the eyes, ears, nose, mouth and skin. Now a team of scientists at the University of Rochester, Washington University in St. Louis, and Baylor College of Medicine has unraveled how the brain manages to process those complex, rapidly changing, and often conflicting sensory signals to make sense of our world.

The answer lies in a relatively simple computation performed by single nerve cells, an operation that can be described mathematically as a straightforward weighted average. The key is that the neurons have to apply the correct weights to each sensory cue, and the authors reveal how this is done.

The study, to be published online Nov. 20 in Nature Neuroscience, represents the first direct evidence of how the brain combines multiple sources of sensory information to form as accurate a perception as possible of its environment.

The discovery may eventually lead to new therapies for people with Alzheimer's disease and other disorders that impair a person's sense of self-motion, says study coauthor Greg DeAngelis, professor and chair of brain and cognitive sciences at the University of Rochester.

This deeper understanding of how brain circuits combine different sensory cues could also help scientists and engineers to design more sophisticated artificial nervous systems such as those used in robots, he adds.

The brain is constantly confronted with changing and conflicting sensory input, says DeAngelis. For example, during IMAX theater footage of an aircraft rolling into a turn "you may find yourself grabbing the seat," he says. The large visual input makes you feel like you are moving, but the balance cues conveyed by sensors in your inner ear indicate that your body is in fact safely glued to the theater seat. So how does your brain decide how to interpret these conflicting inputs?

The study shows that the brain does not have to first "decide" which sensory cue is more reliable. "Indeed, this is what's exciting about what we have shown," says DeAngelis.

The study demonstrates that the low-level computations performed by single neurons in the brain, when repeated by millions of neurons performing similar computations, accounts for the brain's complex ability to know which sensory signals to weight as more important.

"Thus, the brain essentially can break down a seemingly high-level behavioral task into a set of much simpler operations performed simultaneously by many neurons," explains DeAngelis.

The study confirms and extends a computational theory developed earlier by brain and cognitive scientist Alexandre Pouget at the University of Rochester and the University of Geneva, Switzerland and a coauthor on the paper.

The theory predicted that neurons fire in a manner predicted by a weighted accumulation rule - largely confirmed by the neural data. Surprisingly, however, the weighted results were slightly off target from the theoretical predictions.

That difference could explain why behavior varies slightly from subject to subject.

"Being able to predict these small discrepancies establishes an exciting connection between computations performed at the level of single neurons [as opposed to] detailed aspects of behavior," says DeAngelis.

To gather data, researchers designed a virtual-reality system presenting subjects with two directional cues, (1) a visual pattern of moving dots on a computer screen to simulate traveling forward, and (2) physical movement of the subject created through a platform.

Researchers varied the amount of randomness in the motion of the dots to change how reliable the visual cues were relative to the motion of the platform. At the end of each trial, subjects indicated which direction they were heading, to the right or to the left.

The experiments were conducted at Washington University, and the team included Christopher Fetsch, now a post-doctoral fellow at the University of Washington, and Dora Angelaki, now chair of the Department of Neuroscience at Baylor College of Medicine. The research was supported by funding from the National Institutes of Health, the National Science Foundation, the Multidisciplinary University Research Initiative, and the James McDonnell foundation.

The University of Rochester (http://www.rochester.edu) is one of the nation's leading private universities; its College, School of Arts and Sciences, and Hajim School of Engineering and Applied Sciences are complemented by its Eastman School of Music, Simon School of Business, Warner School of Education, Laboratory for Laser Energetics, School of Medicine and Dentistry, School of Nursing, Eastman Institute for Oral Health, and the Memorial Art Gallery.

Original article: http://www.eurekalert.org/pub_releases/2011-11/uor-nck111811.php