What is the Quadratus Plantae?
The quadratus plantae is a small muscle on the bottom of your foot, sitting deep in the arch area toward the heel. It attaches near the heel bone and connects into the tendon of a muscle called flexor digitorum longus, which runs down the leg and helps bend your toes. The quadratus plantae’s main job is to assist toe flexion and, just as importantly, to help line up the pull of that long toe tendon so your toes curl in a more straight, efficient direction rather than twisting slightly to one side.