Brain memory areas. Artwork of the human brain sectioned to reveal the memory areas. At top is the cerebrum (sagittal slice), the site of most conscious and intelligent activities. The limbic system includes the thalamus at centre right (blue), the hippocampus and amygdala (U-shaped) above it, and the mamillary body (thin with bulbous end). The limbic system is involved in emotional expression and memory formation. The spinal cord is at bottom frame with the cerebellum (striped) above it. The coloured spheres (top left) represent chemical neurotransmitters that transmit nerve impulses.