The sympathetic trunk is a chain of nerve ganglia, which are interconnected via a strand of nerve fibers that stretch from the first cervical vertebra to the coccyx, running along both sides of the spinal column. The sympathetic trunk ganglia have connection to the spinal cord neurons, via spinal nerve roots. This chain of nerve ganglia belongs the sympathetic nervous system.
Nerve fibers come out of the sympathetic trunk to establish connection with the paravertebral ganglia, which, in turn, are linked to different nerve plexuses of the peripheral nervous system, such as the cardiac plexus. Through the rami communicantes (communicating branches), the sympathetic trunk is linked up to the anterior rami of spinal nerves.