Flexor digitorum longus
The flexor digitorum longus muscle is located on the inner side of the leg where the tibia is located. The tibia is one of the two bones in the lower part of the human leg and is the inner and larger bone; it may also be referred to as the shinbone. This muscle is thin where it begins, but the size gradually increases as it descends to the end. The origin of the muscles begins at the tibia and extends to the sole of the foot through the ankle joint and splitting into four tendons, each of which connecting to the second through the fifth toes. The flexor digitorum longus muscle is responsible for the movement and curling of the second, third, fourth and fifth toes. This muscle makes it possible for the toes to mold and grip to the surface of the floors, which is important when it comes to maintaining balance on surfaces that are rough. An excellent exercise to strengthen this muscle is to walk barefoot on a surface that is uneven.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Flexor digitorum longus