thoracic spinal nerve 7 thoracic spinal nerve 7 the thoracic spinal nerve 7 (t7) is a spinal nerve of the thoracic segment. thoracic spinal nervethe spinal cord with spinal nerves.detailsidentifierslatinnervi spinalisfma6299anatomical terminology it originates from the spinal column from below the thoracic vertebra 7 (t7).