Identify the extensor digitorum longus muscle. Solution 1.The extensor digitorum longus muscle is situated along the outside of the lower leg, just behind the tibialis anterior. 2.It is situated at the lateral part of the front of the leg. 3. It comes from close to the midline of the tibia and the shaft of the fibula. Its tendon divides into four parts as it passes over the front of the ankle So answer is C.