The largest bundle of nerves in the abdomen, located behind the stomach, near the pancreas. It is sometimes called the abdominal brain, because it is connected to all the abdominal organs. Some psychologists have speculated that this may play a key role in stimulating "dreams".
The solar plexus is a great network of nerves and ganglia situated behind the stomach. The solar plexus is a primary center of the sympathetic nervous system. It provides nerve impulse to the visceral organs, including the liver, stomach, kidneys and adrenal glands.