[TA] muscle of anterior (extensor/dorsiflexor) compartment of leg; origin, lateral condyle of tibia, upper two thirds of anterior margin of fibula; insertion, by four tendons to the dorsal surfaces of the bases of the proximal, middle, and distal phalanges of the second to fifth toes; action, extends the four lateral toes; nerve supply, deep fibular. SYN: musculus extensor digitorum longus [TA], long extensor (muscle) of toes, musculus extensor longus digitorum.