Fetal Development

An artificial model of a human embryo in a developmental stage corresponding to day 12. The upper elliptical structure is the part that will become an embryo including the amniotic sac above it; The lower structure is the yolk sac. The interface between the two structures is an essential element for embryonic development in humans. Both parts are surrounded by a layer of cells which will become the placenta

A human embryo without the need for a sperm egg or uterus

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A pregnancy test detected the fetus in the test tube. The artificial models developed from stem cells - without egg, sperm or uterus - and grew in the laboratory until day 14
Illustration: pixabay.

Fatal exposure in pregnancy

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Illustration: pixabay.

The placenta is the first organ of the fetus

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Chicken embryo. Source: NIH / Jessica Ryvlin, Stephanie Lindsey, and Jonathan Butcher, Cornell University, Ithaca, NY.

open heart

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In the last twenty years there has been a sharp increase in the percentage of children suffering from obesity worldwide. Photo: US Department of Agriculture.

What is fattening around?

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The migration of nerve cells in the brain of mouse embryos: under normal conditions, many cells (white dots) migrate to the upper layer of the cerebral cortex (three pictures on the left), but in the absence of the 3C protein, the cells remain scattered along the migration path (three pictures on the right). Photographed using a confocal microscope. Source: Weizmann Institute magazine.

Dual agents: Immune system proteins help brain development

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Neurons of a mouse embryo grown in a Petri dish. The axons, the extensions of the nerve cells, are the green extensions in the picture. Source: NIH.

A little less, a little more

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Photomicrograph of the formation of the abdominal midline. The middle nest is marked by the intracellular protein laminin (in red, see white arrow). The cells (colored green) migrate towards the midline but do not cross it

the starting line

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Defective male hormonal communication during the development of the reproductive system in the fetus prevents a normal transformation of the fetus from a female configuration to a male configuration. Illustration photo: Tyler Mullins.

Environmental feminization

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Fetus in his mother's womb. Illustration Creations/Shutterstock

First impressions - we begin to pick up words, respond to food and coordinate our eyes and hands long before birth / Paris Jaber

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