T12 nerve root: Definition, Uses, and Clinical Overview
The T12 nerve root is a pair of spinal nerve roots that arise from the T12 spinal segment and exit near the T12–L1 level. It carries sensory signals (feeling) and motor signals (movement control) between the spinal cord and parts of the lower trunk. Clinicians refer to the T12 nerve root when evaluating certain patterns of back, flank, and lower abdominal wall pain or numbness. It is also a key reference point in imaging, injections, and surgical planning around the thoracolumbar junction.