OIAI Leg

Tibialis Anterior Origin

Superiolatereal tibia, intereosseus membrane

Tibialis Anterior insertion

Medial cuneiform, base of 1st metatarsal

Tibialis anterior action

Dorisflexion at talocrural joint, inversion at subtalar joint

Tibialis anterior innervation

Deep fibular n. (L4-5)

Anterior tibialis vascular supply

anterior tibial a

Anterior tibialis dereivation

dorsal

Extensor Hallucis Longus Origin

Anterior fibula, interosseus membrane

Extensor Hallucis Longus Insertion

Base of distal phalanx of hallux

Extensor Hallucis Longus Action

Dorsifleexion at talocrural joint, extension at the MTP and IP joint of hallux

Extensor Hallucis Longus Innervation

Deep fibular nerve (L4-5)

Extensor Hallucis Longus Vascular supply

Anterior tibial a

Extensor Hallucis Longus Derivation

Dorsal

Extensor Digitorum Longus Origin

Anterior and head of fibula, Lateral condyle of tibia, interosseus membrane

Extensor Digitorum Longus Insertion

Bases of distal phalanges of toes 2-5

Extensor Digitorum Longus Action

Dorsiflexion at talocrural joint, Extension at the MTP and IP joint of toes 2-5, some eversion

Extensor Digitorum Longus Innervation

Deep fibular n (L4-5)

Extensor Digitorum Longus Vascular supply

Anteriror tibial a

Extensor Digitorum Longus Derivation

Dorsal

Fibularis tertius origin

Anterior distal fibula

Fibularis tertius insertion

Base of 5th metatarsal

Fibularis tertius Action

Dorsiflexion at talocrural joint, eversion at the subtalar joint

Fibularis tertius Innervation

Deep fibular n (L4-5)

Fibularis tertius Vascular supply

Anterior tibial a

Fibularis tertius Derivation

Dorsal

Fibularis longus Origin

Head and proximal fibula

Fibularis longus insertion

Plantar side of meial cuneiform, base of 1st metatarsal

Fibularis longus action

Plantarflexion at talocrural joint, eversion of foot, supports the transverse arch

Fibularis longus Innervation

Superficial fibular n (L5-S1)

Fibularis longus Vascular supply

Fibular a

Fibularis longus derivation

dorsal

Fibularis brevis origin

Distal half of lateral fibula

Fibularis brevis insertion

Basee of 5th metatarsal

Fibularis brevis action

Plantarrflexion at talocrural joint, eversion of foot

Fibularis brevis innervation

Superficial fibular n (L5-S1)F

Fibularis brevis vascular supply

Fibular a.

Fibularis brevis derivation

Dorsal

Gastrocnemius Origin

Postereior medial/lateral epicondyle

Gastrocnemius Insertion

Calcaneal tuberosity via calcaneal tendon

Gastrocnemius action

Plantarflexion at talo crural joint when knee is exteended, flexion of the knee

Gastrocnemius Innervation

Tibial n (S1-2)G

Gastrocnemius vascular supply

Posterior tibial aG

Gastrocnemius derivation

Ventral

Soleus origin

head, neck, posterior surface of fibula, soleal line of tibia

Soleus Insertion

Calcaneal tuberosity via calcaneal tendon

Soleus action

Plantarflexion at talocrural joint regardless of knee position

Soleus Innervation

Tibial n (S1-2)

Soleus vascular supply

Posterior tibial a

Soleus Derivation

Ventral

Plantaris Origin

Lateral epicondyle of femurP

Plantaris insertion

Calcaneal tuberosity (not part of calcaneal tendon)

Plantaris Action

Minor contribution to plantarflexion and knee flexion

Plantaris Innervation

Tibial n (S1-2)

Plantaris vascular supply

Posterior tibial a

Plantaris derivation

ventral

Popliteus origin

Lateral femoral condyle, postereior horn off lateral meniscus

Popliteus Insertion

Posterior tibia above soleal line

Popliteus Action

Flexes and unlocks knee by internally rotating the tibia on the femur

Popliteus Innervation

Tibial n (S1-2)

Popliteus vascular supply

Posterior tibial a

Popliteus derivation

ventral

Tibialis posterior origin

Interosseus membrane, adjacent borderes of tibia and fibulaT

Tibialis posterior insertion

Navicular tuberosity, all 3 cuneiforms, bases of 2-4 metatarsals

Tibialis Posterior Action

Plantarflexion at talocrural joint, inverrsion of foot, supports transverrse and longitudinal arches of foot

Tibialis posterior Innervation

Tibial n (S1-2)

Tibialis posterior vascular supply

Posterior tibial a

Tibialis Posterior derivation

Ventral

Flexor digitorum longus Origin

Middle posterior surface of tibia

Flexor digitorum longus insertion

Bases of 2-5 distal phalanges

Flexor digitorum longus action

Plantarflexion at talocrural joint, inversion of foot, plantarflexion at MTP and IP joints of toes 2-5

Flexor digitorum longus Innervation

Tibial n (S1-2)

Flexor digitorum longus vascular supply

Posterior tibial a

Flexor digitorum longus derivation

ventral

Flexor hallucis longus origin

Posterior fibula, interosseus membrane

Flexor hallucis longus insertion

Base of 1st distal phalanx

Flexor hallucis longus action

Plantarflexion of talocrural joint, inversion of foot, plantarflexion at MTP and IP joints of hallux, support for medial longitudinal arch

Flexor hallucis longus innervation

Tibial n. (S1-2)

Flexor hallucis longus vascular supply

Posterior tibial a

Flexor hallucis longus derivation

Ventral