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Foetal brain. Lateral (side) view of the right hand side of the brain of a 24 week old foetus, the front of the brain is at right. The foetal developing spinal cord (lower right) can be seen protruding below the brain. Although at this stage of development the foetal brain shows active auditory and visual responses, it is yet to develop the characteristic folds. (KEYSTONE/SCIENCE PHOTO LIBRARY/DR G. MOSCOSO)