Final answer:
The sympathetic division's outflow of the autonomic nervous system originates from the thoracic and lumbar regions of the CNS, known as the thoracolumbar system.
Step-by-step explanation:
The outflow of the sympathetic division occurs from the thoracic and lumbar regions of the Central Nervous System (CNS). Specifically, it originates from the lateral horn of the thoracolumbar spinal cord, reflecting its anatomical basis also known as the thoracolumbar system. The sympathetic chain ganglia, where most sympathetic ganglia are located, runs alongside the vertebral column, and these ganglia are distributed from the cervical to the sacral regions. However, the actual connections to the spinal cord are only from the thoracic and lumbar regions, where preganglionic neurons send projections to various target organs and systems throughout the body.