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The video for the midsaggital plastic brain with audio is 510 MB of memory. That is far too large for the Internet to handle as of today. A CD can hold only 680 MB approximately. Therefore, I cut or divided that video into five separate smaller segments or videos. The image of the video (below) is large so you can see or identify the important details. This video is the fourth of those five. NOTE: Wait for the rest of the video to download after you see the picture.

Structures in video: interventricular aquaduct (or aquaduct of Sylvius), 3rd and 4th ventricles, pineal body (or pineal mass) corpora quadrigemina, tectum lamina