Carnegie Stages - 1st Trimester Pregnancy2nd Trimester Pregnancy3rd Trimester PregnancyCarnegie Stage 1 - Fertilization Carnegie Stage 2 - CleavageCarnegie Stage 3 - Early BlastocystCarnegie Stage 4 - ImplantationCarnegie Stage 5 - Implantation CompletedCarnegie Stage 6 - GastrulationCarnegie Stage 7 - NeurulationCarnegie Stage 8 - Primitive PitCarnegie Stage 9 - First SomitesCarnegie Stage 10 - Neural Folds, Heart TubeCarnegie Stage 11 - Optic VesicleCarnegie Stage 12 - Upper Limb BudsCarnegie Stage 13 - First Layer Skin Carnegie Stage 14 - Esophagus FormingCarnegie Stage 15 - Cerebral Hemispheres FormingCarnegie Stage 16 - Hindbrain DevelopingCarnegie Stage 17 - Primitive germ cellsCarnegie Stage 19 - Semicircular Canals Forming in Inner EarCarnegie Stage 20 - Spontaneous MovementCarnegie Stage 21 - Intestines MigrateCarnegie Stage 22 - Brain can move musclesCarnegie Stage 23 - End of embryonic developmentWeeks 10 to 11 - Basic Brain Structure CompleteWeeks 12 to 13 - Fetus begins to move aroundWeeks 14 to 15 - Sexual organs now clearly visibleWeeks 16 to 17 - Fingerprints and toe prints beginWeeks 18 to 19 - Brown fat surrounds the lymphatic system.Weeks 20 to 21 - Bone marrow starts making blood cellsWeeks 22 to 23 - Inner ear bones harden, hearing possibleWeeks 24 to 25 - Sensory brain waves begin to activateWeeks 26 to 27 - Lungs begin to produce sufacantWeeks 28 to 29 - Brain Surface Convolutions BeginWeeks 39 to 40 - Baby full termWeeks 41 - 41 Baby full termWeeks 38 to 39 - Fetal liver is producing blood cellsWeeks 36 to 37 - Body is round and plump with white fatWeeks 34 to 35 - Gastrointestinal system still very immatureWeeks 32 to 33 - Fetus begins to develop immune systemWeeks 30 to 31 - Rapid brain growth; head size increasesPregnancy - 1st TrimesterPregnancy - 1st Trimester



The Visible Embryo is a visual guide through fetal development from fertilization through pregnancy to birth. As the most profound physiologic changes occur in the "first trimester" of pregnancy, these Carnegie stages are given prominence on the birth spiral.

The shape and location of embryonic internal structures and how they relate and are connected to each other is essential to understanding human development. Medical professionals create a mental picture of this process in order to determine how well the fetus is progressing. It is also the basis of knowing how and when errors in development occur and if a possibility exists for a corrective intervention.

It is equally important for expectant parents to understand the relationship of these internal structures and how their infant develops through pregnancy.

Creating the images for The Visible Embryo, included capturing data from slides and three dimensional structures on fetal anatomy in The National Institutes of Health, Carnegie Collection of embryos, as well as from 3D and 4D ultra sound images.


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.

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News Alerts Aug 22, 2014

Embryonic cell fate sealed by the speed of a signal  Finding the 3-D structure of a neuroreceptor  Prenatal alcohol affects all brain development  How enzymes know what to keep or trash in a cell  Scientists find calorie-burning switch in brown fat  A neural 'sweet spot' may help curb obesity  Turing theory (1952) explains formation of fingers  Autism, Sensory Processing Disorders not the same  Sugar chains guide stem cells to a neural fate  Brain cells arrange themselves by birth order  Mom's DDT exposure linked to obesity and diabetes  Molecular competition specializes adult stem cells  Preterm children's brains can catch up years later  Mothers teach babies fears via mother's own odor  Age of female puberty depends on only one parent  Kisspeptin may trigger IVF ovulation more safely  Key to egg implantation in uterus   Found, crucial path to embryo facial development  Good mothering' hardwires infant brain  Two proteins 'pulse' information into memory  Gene link to fatal child inflammatory disease SAVI   Life-saving stem cells may be easier to create Sexual selection linked to placenta formation "You are what your grandfather ate" One injection stops diabetes in its tracks  Gene essential in embryos, toxic in adult cell division  Timing is not only ticking  An amazing'switch' in our brains  Reverse engineering brain circuits Babies of healthy moms worldwide are similar Dad's ethnic origin influences child's birthweight  Nuclear transfer best for creating stem cells  Schizophrenia gene affects brain cell development  Embryonic stem cells organize geometrically  Child life stress can leave lasting impact on brain 3-D view of brain's center of memory and learning  How sperm bore into the egg "Enhancer" gene region triggers cell pluripotency  Caffeine affects boys and girls differently in puberty Scoliosis and Marfans linked to rare gene mutations

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