Lower Leg OIAs (copy)

Tibialis Anterior (Origin)

Lateral condyle and proximal lateral tibia, interosseous membrane

Tibialis Anterior (insertion)

Medial cuneiform, base of 1st metatarsal

Tibialis Anterior (action)

Dorsiflexes ankle, inverts ankle

Extensor Digitorum longus (Origin)

Lateral condyle of tibia, proximal anterior surface of fibula

Extensor Digitorum longus (insertion)

Middle and distal phalanges of digits 2-5

Extensor Digitorum longus (action)

Dorsiflexes ankle, extends digits 2-5

Extensor Hallucis Longus (Origin)

Middle and anterior surface of fibula

Extensor Hallucis Longus (insertion)

Dorsal aspect of base of distal phalanx of great toe

Extensor Hallucis Longus (action)

Dorsiflexes ankle, extends great toe

Fibularis longus (Origin)

Head of fibula, proximal lateral fibula

Fibularis longus (insertion)

Plantar base of 1st metatarsal, plantar surface of medial cuneiform

Fibularis longus (action)

Plantarflexes ankle, everts ankle

Fibularis brevis (Origin)

Distal lateral surface of fibula

Fibularis brevis (insertion)

Dorsal surface of 5th metatarsal tuberosity

Fibularis brevis (action)

Plantarflexes ankle, everts ankle

Fibularis tertius (Origin)

Distal anterior surface of fibula

Fibularis tertius (insertion)

Dorsal base of 5th metatarsal

Fibularis tertius (action)

Dorsiflexes ankle, everts ankle

Gastrocnemius (Origin)

Lateral surface of lateral condyle of femur, popliteal surface superior to medial condyle of femur

Gastrocnemius (insertion)

Posterior calcaneus

Gastrocnemius (action)

Plantarflexes ankle, flexes knee

Soleus (Origin)

Posterior fibular head, proximal posterior surface of fibula, soleal line of tibia

Soleus (insertion)

Posterior calcaneus

Soleus (action)

Plantarflexes ankle, stabilizes leg over ankle

Plantaris (Origin)

Inferior end of lateral supracondylar line of femur

Plantaris (insertion)

Posterior calcaneus

Plantaris (action)

Plantarflexes ankle

Popliteus (origin)

Lateral surface of the lateral condyle of the femur, lateral meniscus

Popliteus (insertion)

Posterior tibia superior to soleal line

Popliteus (action)

Flexes knee, unlocks knee by rotating femur on locked tibia

Flexor hallucis longus (Origin)

Distal posterior fibula, interosseous membrane

Flexor hallucis longus (insertion)

Plantar base of distal phalanx of great toe

Flexor hallucis longus (action)

Plantarflexes ankle, flexes great toe

Flexor digitorum longus (Origin)

Medial posterior tibia inferior to soleal line

Flexor digitorum longus (insertion)

Plantar bases of distal phalanges of digits 2-5

Flexor digitorum longus (action)

Plantarflexes ankle, flexes digits 2-5

Tibialis Posterior (Origin)

Posterior tibia inferior to soleal line, proximal posterior fibula, interosseous membrane

Tibialis Posterior (insertion)

Tuberosity of navicular bone, plantar surface of cuneiforms, plantar surface of cuboid, plantar bases of 2-4 metatarsals

Tibialis Posterior (action)

Plantarflexes ankle, inverts ankle