What Is the Trapezius Muscle? Trapezius muscles are large, paired, triangular muscles in the back of your neck and upper back. They extend down your back, but they’re mostly involved in the movements ...

Have you ever slept wrong and woken up with a kink in your neck? The muscle that's kinked is part of your trapezius. The more you know about your traps, the less of a pain in the neck they will be.

The trapezius muscle starts right below the skull, runs down the neck and across the shoulders, and then continues down the spine in a “V” shape. It works to stabilize your shoulders and upper back.