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# Formation of the Divisions of the Nervous System ## Formation of the Neural Tube and Neural Crest The image displays a diagram illustrating the formation of the divisions of the nervous system, specifically focusing on the development of the neural tube and neural crest. **Left Side (Primary Ves...

# Formation of the Divisions of the Nervous System ## Formation of the Neural Tube and Neural Crest The image displays a diagram illustrating the formation of the divisions of the nervous system, specifically focusing on the development of the neural tube and neural crest. **Left Side (Primary Vesicles):** The left side depicts the primary vesicles during early embryonic development. These vesicles are labeled as follows: * Prosencephalon * Mesencephalon * Rhombencephalon **Right Side (Secondary Vesicles):** The right side shows the later formation of secondary vesicles. These vesicles evolve into distinct brain regions. * **Prosencephalon** breaks down into: * Telencephalon * Diencephalon * **Mesencephalon** remains a single structure. * **Rhombencephalon** breaks down into: * Metencephalon * Mielencephalon **Adult Brain:** The final part of the diagram displays the adult brain with the labeled structures corresponding to the previously mentioned secondary vesicles: * Telencephalon * Diencephalon * Hypothalamus * Mesencephalon * Metencephalon * Mielencephalon **Medulla Spinalis:** The diagram shows a continuous structure called the medulla spinalis (spinal cord) extending from the rhombencephalon. This diagram provides a visual representation of the developmental stages of the central nervous system. The labels along with the color-coded sections/structures help to understand how the early structures of the embryo diversify into distinct components of the adult brain and spinal cord.