The Greater Splanchnic Nerve is a major nerve in the autonomic nervous system, primarily responsible for transmitting signals from the spinal cord to the abdominal organs. It originates from the thoracic spinal nerves, specifically from T5 to T9, and carries sympathetic fibers that influence functions such as digestion and blood flow. This nerve plays a crucial role in the body's response to stress by regulating the activity of the adrenal glands and other visceral organs. It helps control the release of hormones like adrenaline, which prepares the body for a "fight or flight" response, impacting overall physiological functions.