This injection targets the Stellate Ganglion – a bundle of sympathetic nerves in the region of your neck. These nerves travel along both sides of your spine and are responsible for controlling bodily functions that we have no manual control over. The Stellate Ganglion in particular assists with functions such as eye dilation, sweating and heart rate. When nerves are compressed or other issues may be arising in this area, a nerve block will assist your doctor in identifying and treating whatever issue may be affecting you.