Where did the child's organs (heart, brain, etc.) come from in the mother's belly - out of nowhere?

Where did the child's organs (heart, brain, etc.) come from in the mother's belly - out of nowhere?

34: The Science of Safety with Stephen Porges

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answers (2)

Answer 1
September, 2021

First, a bunch of identical cells appear from the zygote. After some time, the mechanism of specialization (or differentiation, I don't remember the exact name) is triggered in them - in strictly defined parts of the embryo, the cells become different. Then they specialize further and further, and as they develop during this time, they gradually split into departments. From these departments, various tissues are formed, from tissues, organs, from organs of the system. This process is called the unpretentious term "organogenesis".

This is if it is straight VERY simplified. In fact, it is easy to Google for the query "human pregnancy" or "development of a human embryo in the womb" (even "human ontogenesis", but this applies not only to intrauterine development).

Answer 2
September, 2021

not from nowhere, but from tissues
the embryo is material, which means it consists of tissues - ectoderm, endoderm, mesoderm - from which the primary intestine begins to develop first, then the neural tube, and the chord (future spine). There is also a mesenchyme inside, and the organs begin to develop further (skin, etc.)

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