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Lower leg
Muscle | Origin | Insertion | Action |
---|---|---|---|
Tibialis Anterior | Ant. proximal tibia (lat. tibial condyle, prox. 2/3 of anterolateral surface of tibia & interosseous membrane) | Medial cuneiform & base of 1st metatarsal (med. planar surfaces) | Dorsiflexion & inversion of ankle |
Extensor Digitorum Longus | Prox. 2/3 of fibula, interossesous membrane, lat. condyle of tibia (ant. surfaces) | Dorsal surface of digits 2-5 | Extension of digits 2-5, dorsiflexion & eversion of foot |
Extensor Hallucis Longus | Ant. middle 1/3 of fibula & interosseous membrane | Base of distal phalanx of big toe (dorsal surface) | Extension of big toe, dorsiflexion & inversion of foot |
Peroneus Longus | Head & proximal lat. shaft of fibula | Medial cuneiform & base of 1st metatarsal | Eversion & plantar flexion of foot |
Peroneus Brevis | Distal lat. 1/2 of fibula | Base of 5th metatarsal (lateral aspect) | Eversion & plantar flexion of foot |
Peroneus Tertius | Distal 1/3 of ant. fibula | Base of 5th metatarsal (dorsal surface) | Dorsiflexion & eversion of foot |
Gastrocnemius | Above medial and lateral condyle of femur (post. surface) | Calcaneus (via calcaneal tendon) | Plantar flexion, knee flexion & inversion of foot |
Soleus | Soleal line of tibia & upper fibula | Calcaneus (via calcaneal tendon) | Plantar flexion & inversion of foot |
Plantaris | Distal posterolateral femur (above lat. head of gastroc.) | Calcaneus (via calcaneal tendon) | Plantar flexion & knee flexion |
Popliteus | Lat. femoral condyle | Proximal post. tibia (med. side above soleal line) | Unlocks knee from wxtended position, knee flexion |
Tibialis Posterior | Post. proximal 2/3 of tibia,fibula & interosseous membrane | Navicular, all 3 cuneiforms, 2nd-4th metatarsals, cuboid & calcaneus (Fans out of plantar surface of foot) | Plantar flexion & inversion of foot |
Flexor Digitorum Longus | Post. middle 1/3 of tibia | Base of distal phalanges 2-5 (plantar surface) | Flexion of digits 2-5, plantar flexion & inversion of foot |
Flexor Hallucis Longus | Post. inf. 2/3 of fibula & interosseous membrane | Distal phalanx of big toe (plantar surface) | Flexion of big toe, plantar flexion & inversion of foot |