It originates inferiorly to the origin of the extensor digitorum longus: along the distal third of the medial surface of the fibula.ĭo you prefer a more interactive learning approach? Our muscles of the leg quizzes and labeled diagrams might be just what you're looking for. The fibularis tertius muscle is considered to be part of the extensor digitorum longus muscle. ![]() This muscle extends the toes and dorsiflexes the foot. Each one of these tendons splits into two extensions that insert onto the appropriate middle and distal phalanges of the lateral four toes. The tendon of the muscle extends over the dorsal surface of the foot and divides into four terminal tendons. The muscle fibers descend through the anterior compartment of the leg and converge to a tendon before the ankle. Its origin is lateral and above the origin of the extensor digitorum muscle, precisely in the proximal half of the medial surface of the fibula and lateral condyle and shaft of the tibia. This muscle is the most posterior and lateral of all the muscles of the anterior leg. This article will discuss the anatomy, function, and clinical importance related to the anterior muscles of the leg. Tibialis anterior, Extensor hallucis longus, Fibularis (peroneus) tertius, Extensor digitorum longus) Strains, tendon injuries, compartment syndrome, crush syndrome Insertion: Dorsal surface of base of metatarsal bone 5įunction: Talocrural joint: Foot dorsiflexion Subtalar joint: Foot eversionĪnterior tibial artery (branch of the popliteal artery) Origin: (Distal third of) Medial surface of fibula Insertion: Distal and middle phalanges of digits 2-5įunction: Metatarsophalangeal and interphalangeal joints 2-5: Toe extension Talocrural joint: Foot dorsiflexion Subtalar joint: Foot inversion Origin: (Proximal half of) Medial surface of fibula, Lateral tibial condyle, Interosseus membrane Insertion: Base of distal phalanx of great toeįunction: Metatarsophalangeal and interphalangeal joint 1: Toe extension Talocrural joint: Foot dorsiflexion Origin: (Middle third of ) Medial surface of fibula, Interosseous membrane Insertion: Medial cuneiform bone, Base of metatarsal bone 1įunction: Talocrural Joint: Foot dorsiflexion Subtalar joint: Foot inversion Supports medial longitudinal arch of foot Origin: Lateral tibial condyle, proximal half of lateral tibial shaft, Interosseous membrane Because of the nature of their origins and insertions and consequently their movements, these muscles are known as the dorsiflexors of the leg. When observed macroscopically, this is seen as the anterolateral region of the leg. The muscles of the anterior leg are located within the anterior compartment of the leg. This article will focus specifically on the muscles in the anterior compartment of the leg as well as any clinical relevance. Not only are these groups located within the appropriate aspect of the tibia and fibula, but they are also defined by intermuscular septa and surrounded by the deep fascia of the leg. ![]() ![]() When studying the muscles of the leg, they can be compartmentalized into four primary groups: the anterior, lateral (fibular), superficial posterior, deep posterior compartments.
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