If youve experienced physical trauma and have trouble moving your neck you may have a spinal cord injury Here’s what to do ...

“Human spinal circuitry is very sophisticated – it’s not just a bunch of reflexes controlled by the brain,” said Harkema, now with the Kessler Foundation, a rehabilitation research nonprofit.

This was to test the stretch reflexes in your spinal cord, which resist muscle stretching to give you muscle tone to hold your body up against gravity for example, fast corrections after tripping.