Development of the brain and brain stem in the fetus This set of illustrations ends at approximately the end of the seventh month of gestation. In the last few weeks in the womb, the fetus begins to develop the characteristic sulci and gyri (the furrows and ridges of the brain, respectively) that allow the brain to have a much larger surface area, and many more neurons in the cerebral cortex (the outermost layer of the brain, responsible for most higher functions) than a smooth surface would be able to fit. Illustration by Jules Cloquet (1790-1883)

Development of the brain and brain stem in the fetus

This set of illustrations ends at approximately the end of the seventh month of gestation. In the last few weeks in the womb, the fetus begins to develop the characteristic sulci and gyri (the furrows and ridges of the brain, respectively) that allow the brain to have a much larger surface area, and many more neurons in the cerebral cortex (the outermost layer of the brain, responsible for most higher functions) than a smooth surface would be able to fit.

Illustration by Jules Cloquet (1790-1883)

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