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Development of the human embryonic brain

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... so we are introducing ourselves into this process about one month after fertilization when the entire embryo is smaller than the size of a dime. And we're gonna look into the nervous system where relatively small numbers of cells have been allocated and then monitor over the nine months of human gestation, the increase in the number of cells and the change in the shape of the central nervous system. So by three months we have something like a millions cells. The nervous system is beginning to exceed the size of a dime. You can see that the future forebrain and the cortical region are expanding disproportionately to the rest of the nervous system. By six months we have hundreds of millions of neurons and the brain is beginning to take now a familiar shape. You can see the beginnings of the indentations, the sulci, and gyri that Eric [Kandel] described. So that by the time we appoach the 8th and 9th months this is now a familiar picture. We have tens of billions of nerve cells present. After birth, there is yet further addition of cells to produce the hundred billion or so nerve cells that occupy the human brain. One remarkable feature is that even in adult life, new neurons are being added. There is evidence that the rate of new neuronal production depends on the degree of richness of your environment. So every time you come to the Howard Hughes Medical Institute headquarters here, you're gonna be producing neurons at a remarkable rate and you will leave with more neurons than you came in with. And so, this process, neuronal generation, is really drives all aspects of behaviour.

Video Details

Duration: 1 minute and 40 seconds
Country: United States
Language: English
Producer: Howard Hughes Medical Institute
Views: 821
Posted by: hakimiyetiilmiye on Nov 20, 2010

The fetal brain grows enormously during pregnancy, both in terms of its size and the number of neurons it has.

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