Sympathetic nervous system is thoracolumbar in origin.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Sympathetic Nervous System (SNS):**
- The SNS is a part of the autonomic nervous system that prepares the body for stressful or emergency situations. This is often referred to as the "fight or flight" response.

2. **Identifying the Origin of the SNS:**
- The term "thoracolumbar" refers to the regions of the spinal cord where the sympathetic nervous system originates. Specifically, it includes the thoracic (T1-T12) and lumbar (L1-L2) segments of the spinal cord.

...