Neural development

Diagram

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  Human Cortical Development. Gyrification, gyration/sulcation, cortical folding, cortical convolution, fissuration or fissurization.
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  Slices through the brain at the mid-ventricular level and at the level of the centrum semiovale from six of the eight MR images obtained between 26 and 39 week gestational age

Timeline in human

3 weeks

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  Human embryo between eighteen and twenty-one days old.

4 weeks

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  Brain of a four-week old human embryo.
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  Section of medulla spinalis of a four weeks’ embryo.
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  Exterior of brain of human embryo of four and a half weeks.
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  Brain of human embryo of four and a half weeks, showing interior of fore-brain.
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  Human embryo from thirty-one to thirty-four days.

5 weeks

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  Exterior of brain of human embryo of five weeks.
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  Interior of brain of human embryo of five weeks.
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  Human Embryo (7th week of pregnancy, 5th week p.o.)

6 weeks

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  Diagram of the various parts of the brain of a six-week old embryo.
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  A diagram showing the brain and major nerves of a 6 week old human fetus.

7 weeks

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  9-Week Human Embryo from Ectopic Pregnancy (7th week p.o.)

3 months

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  Hind-brain of a human embryo of three months—viewed from behind and partly from left side.
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  Median sagittal section of brain of human embryo of three months.

4 months

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  Inferior surface of brain of embryo at beginning of fourth month.
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  Median sagittal section of brain of human embryo of four months.

5 months

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  Outer surface of cerebral hemisphere of human embryo of about five months.