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Due to its attachments, flexor digitorum longus performs its action in four different joints; talocrural (ankle joint), talocalcaneal (subtalar joint), metatarsophalangeal and interphalangeal joints. The main function of this muscle is the flexion of the foot and toes.
The flexor digitorum longus (FDL) is part of the deep muscle group of the posterior compartment of the lower leg [1]. Its primary action is flexion of digits 2-5 in the foot.
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 grip the surface of floors, which is important when it comes to maintaining postural balance on surfaces that are rough or uneven.
The flexor digitorum longus is a muscle within the deep compartment of the posterior leg. It is a thin muscle, located medially within the compartment. Attachments: Originates from the medial surface of the tibia and attaches to the plantar surfaces of the lateral four digits. Actions: Flexion of the lateral four toes.
Flexor digitorum longus. Origin. Posterior surface of tibia distal to popliteal line. Insertion. Splits into four slips after passing through medial intermuscular septum of plantar surface of foot; these slips then insert on plantar surface of bases of 2nd - 5th distal phalanges. Action. Flexes toes 2 - 5; also helps in plantar flexion of ankle.
The flexor digitorum longus acts on four joints – the ankle, the metatarsophalangeal joints, the interphalangeal joints, and the subtalar joint. We have seen that at the ankle, this muscle is involved in plantarflexion by moving the foot backwards towards the sole of the foot.
Actions & Testing. The flexor digitorum longus muscle is involved in multiple actions: - flexes the distal phalanges at the distal interphalangeal joints of the second, third, fourth and little toes; - flexes the middle phalanges at the proximal interphalangeal joints of the same toes;