Tibialis Anterior
O: lateral condyle of tibia, superior lateral surface of tibia
I: medial (1st
) cuneiform (medial and inferior surface), base of first metatarsal
A: inversion of foot, dorsiflexion at ankle joint
N: deep fibular n.
BS: anterior tibial a.
Extensor Digitorum Longus
O: lateral condyle of tibia, upper 3/4 of anterior fibula, interosseous membrane
I: middle and distal phalanges of digits 2-5
A: extension of all joints of digits 2-5, dorsiflexion at ankle joint
N: deep fibular n.
BS: anterior tibial a.
Extensor Hallucis Longus
O: middle 1/3 of anterior fibula, interosseous membrane
I: distal phalanx of digit one
A: extension of digit one, dorsiflexion at ankle joint
N: deep fibular n.
BS: anterior tibial a.
Fibularis (Peroneus) Longus
O: head and upper 2/3 of lateral fibula
I: base of first metatarsal, medial (1st
) cuneiform
A: eversion of foot, plantarflexion at ankle joint
N: superficial fibular n.
BS: fibular a.
Gastrocnemius
O: superior surface of the medial and lateral condyles of femur
I: calcaneus (via calcaneal tendon)
A: plantarflexion at the ankle joint; flexion of leg
N: tibial n.
BS: popliteal a., posterior tibial a.
Tibialis Posterior
O: upper 2/3 of posterior tibia and fibula, interosseous membrane
I: navicular, 1st and 2nd cuneiform, cuboid, calcaneus, metatarsals 2-4
A: inversion of foot, plantar flexion at ankle joint, adduction of toe-end of foot
N: tibial n.
BS: posterior tibial a.
Flexor Hallucis Longus
O: middle 1/3 of posterior fibula, interosseous membrane
I: base of distal phalanx of digit one
A: flexion of digit one (all joints), plantarflexion at ankle joint (weak), supports longitudinal arches of foot
N: tibial n.
BS: posterior tibial a.
Flexor Digitorum Longus
O: middle 1/3 of posterior tibia
I: base of distal phalanges of digits 2-5
A: flexion of digits 2-5, plantarflexion at ankle joint (weak), supports longitudinal arches of foot
N: tibial n.
BS: posterior tibial a.
