The question seems to be incomplete as it does not provide the options to choose from. The embryonic neural tube develops into the central nervous system, including the brain and spinal cord. The neural tube itself forms in a process called neurulation, where it begins as a flat sheet of cells and then folds into a tube.

However, if we're talking about the primary vesicles, the neural tube initially develops into three sections: the forebrain (prosencephalon), midbrain (mesencephalon), and hindbrain (rhombencephalon). If these are the portions referred to in the question, the midbrain or mesencephalon develops third.

Please provide more context or the options to choose from for a more accurate answer.

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The question seems to be incomplete as it does not provide the options to choose from. The embryonic neural tube develops into the central nervous system, including the brain and spinal cord. The neural tube itself forms in a process called neurulation, where it begins as a flat sheet of cells and then folds into a tube.

However, if we're talking about the primary vesicles, the neural tube initially develops into three sections: the forebrain (prosencephalon), midbrain (mesencephalon), and hindbrain (rhombencephalon). If these are the portions referred to in the question, the midbrain or mesencephalon develops third.

Please provide more context or the options to choose from for a more accurate answer.

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The question seems to be incomplete as it does not provide the options to choose from. The embryonic neural tube develops into the central nervous system, including the brain and spinal cord. The neural tube itself forms in a process called neurulation, where it begins as a flat sheet of cells and then folds into a tube.

However, if we're talking about the primary vesicles, the neural tube initially develops into three sections: the forebrain (prosencephalon), midbrain (mesencephalon), and hindbrain (rhombencephalon). If these are the portions referred to in the question, the midbrain or mesencephalon develops third.

Please provide more context or the options to choose from for a more accurate answer.

When the brain develops from the embryonic neural tube,which of the following portions develops third?

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