In a complex behavior, such as reading and interpreting a poem, how many brain systems are typically involved?

The hippocampus inside our brain consists of two “horns” that curve back from the amygdala. The hippocampus is important in storing information in long-term memory. If the hippocampus is damaged, a person cannot build new memories, living instead in a strange world where everything he or she experiences just fades away, even while older memories from the time before the damage are untouched. In this way it can help in reading and interpreting a poem.