(gang'glē-ă sim'pă-thet'ik trŭngk) The clusters of postganglionic neurons located at intervals along the sympathetic trunks, including the superior cervical, middle cervical, and cervicothoracic (stellate) ganglion, the thoracic, lumbar, and sacral ganglia, and the ganglion impar. Synonym(s): ganglia trunci sympathici, paravertebral ganglia.