Ascending part of trapezius

Pars ascendens musculi trapezii · Vzestupná část trapézového svalu

Muscles

Looks like

The lower fan of the trapezius, running from the spines of the middle and lower chest vertebrae up to the inner end of the shoulder blade spine.

Pulls the shoulder blade down and helps rotate it upward when raising the arm overhead.

Often weak in people with shoulder pain; prone 'Y' raises train it. Powered by the accessory nerve.