The cerebral cortex,with its characteristic fissures,does not develop until the middle of pregnancy.

Name: The cerebral cortex,with its characteristic fissures,does not develop until the middle of pregnancy.
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The cerebral cortex, with its characteristic fissures, begins to develop around the 20th week of gestation, which is in the middle of pregnancy. Before this time, the brain has a smooth surface without the characteristic folds and fissures.

The Cerebral Cortex,with Its Characteristic Fissures,does Not Develop Until the Middle