Weeks 30 to 31 - Body growth slowsWeeks 32 to 33 - Fetal immune system beginsWeeks 34 to 35 - Placenta one-sixth fetal weightWeeks 36 to 37 - Bone ossificationWeeks 38 to 39 - Lungs produce surfactant Weeks 39 to 40 - Baby full termWeeks 39 to 40 - Baby full termWeeks 26 to 27 - Fat accumulates under skinWeeks 24 to 25 - Lungs are capable of breathing airWeeks 22 to 23 - Sensory brain waves begin to activateWeeks 20 to 21 - Foetus may suck thumbWeeks 20 to 21 - Testes begin descendingWeeks 18 to 19 - Ovaries contain primitive egg cellsWeeks 16 to 17 - Myelin sheath formingWeeks 14 to 15 - Eyes and ears close to final positionWeeks 12 to 13 - Foetal MovementWeeks 10 to 11 - Liver starts to secrete bileCarnegie Stage 23 - End of embryonic developmentCarnegie Stage 22 - Brain can move musclesCarnegie Stage 21 - Intestines MigrateCarnegie Stage 20 - Spontaneous MovementCarnegie Stage 19 - Detectable Brain WavesCarnegie Stage 17 - Primitive germ cellsCarnegie Stage 16 - Hindbrain DevelopingCarnegie Stage 15 - Cerebral Hemispheres FormingCarnegie Stage 14 - Esophagus FormingCarnegie Stage 13 - First Layer Skin Carnegie Stage 12 - Upper Limb BudsCarnegie Stage 11 - Optic VesicleCarnegie Stage 10 - Neural Folds, Heart TubeCarnegie Stage 9 - First SomitesCarnegie Stage 8 - Primitive PitCarnegie Stage 7 - NeurulationCarnegie Stage 6 - GastrulationCarnegie Stage 5 - Implantation CompletedCarnegie Stage 4 - ImplantationCarnegie Stage 3 - Early Blastocyst Carnegie Stage 2 - CleavageCarnegie Stage 1 - Fertilization3rd Trimester Pregnancy2nd Trimester PregnancyCarnegie Stages - 1st Trimester Pregnancy
What is The Visible Embryo?What are the Carnegie Stages?Who are the Content Experts?
The Visible Embryo began in 1993 as an attempt to use the newly developing world wide web to teach developmental biology. Source material teaching embryology was scarce at the time yet embryology was fast becomming an exciting field breaking down the barriers to infertility. Specialists and educators needed sophisticated teaching tools to get across the concepts of how an embryo evolves from a single cell into a baby.

The National Institute of Child and Human Development wants their collection of 10,000 human embryos made available to the medical and scientific communities for study. Part of their collection is designated as the Carnegie Collection of Human Development and consists of 650 serial microscopic cross-sections of human embryos. Located in the Armed Forces Institute of Pathology (AFIP) in Washington, D.C., the Carnegie Collection of Human Development is an invaluable source of material for teaching normal growth as well as the origins of developmental disorders.

Three dimensional reconstruction of these slides in order to view the development of internal organ systems was and is a primary focus for the collection. However, in 1994, only a few select computers could display in 3D. The process of reconstructing existing embryo slides into accurate embryo models would also require developing a sophisticated program needing years to perfect.

Teaching the concepts of early development required another approach. Two Small Business Innovative Research grants (SBIR) were awarded by The National Institute of Child and Human Development to Ms. Carmen Arbona to instructionally design and organize the study of early embryology using the Carnegie Collection. The September 1993 release of MOSAIC, the first graphical internet browser for the World Wide Web (developed at the The National Center for Supercomputing Applications), guaranteed interactivity between art and text. Now the potential of the net as a new communiction medium could begin .

The Visible Embryo immediately became connected to scientific and medical facilities and is now linked to over 600 educational sites. Over 86,000 page views per week and more than 12,000 viewers per day in January, 2006 are continuing to increase its viewership. More than 8 million page views and 9 million unique visitors have visited the site since 1993. Public interest in embryology is inspired by pregnancy, discoveries in stem cell research, and questions about anomalies of birth. We are all curious about life and how we develop.





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Who Are The Content Experts?What are the Carnegie Stages?Who are the Content Experts?What are the Carnegie Stages?