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Foetal brain. Ventral (bottom) view of the brain of a 24-week-old foetus, the front of the brain is at top. The foetus' developing spinal cord (lower centre) can be seen protruding from the brain. Below the spinal cord is the cerebellum, which controls motor function and maintenance of balance. The small organ at centre is the pituitary gland. This is an endocrine gland whose overall role is to regulate growth and metabolism. At this stage of development the foetal brain shows active auditory and visual responses. (KEYSTONE/SCIENCE PHOTO LIBRARY/DR G. MOSCOSO)