The thoracic ganglia are paravertebral ganglia that are located in the thoracic portion of the sympathetic trunk. There are usually eleven or twelve thoracic ganglia. The thoracic ganglia are where the thoracic splanchnic nerves come out. These splanchnic nerves supply some sympathetic innervation to abdominal structures. The ganglia have both white and gray rami communicantes. The white rami carry sympathetic fibers from the spinal cord to the sympathetic trunk.