Posterior Lower Leg OINAPs

gastrocnemius lateral head origin

lateral aspect of lateral condyle of femur

gastrocnemius lateral head insertion

posterior surface of calcaneus via calcaneal tendon

gastrocnemius lateral head nerve

tibial nerve (S1-S2)

gastrocnemius lateral head action

ankle plantarflexion during knee extension, raise heel during walking, knee flexion

gastrocnemius lateral head perfusion

gastrocnemius medial head origin

popliteal surface of femur, superior to medial condyle of femur

gastrocnemius medial head insertion

posterior surface of calcaneus via calcaneal tendon

gastrocnemius medial head nerve

tibial nerve (S1-S2)

gastrocnemius medial head action

ankle plantarflexion during knee extension, raise heel during walking, knee flexion

gastrocnemius medial head perfusion

soleus origin

posterior aspect of head of fibula, superior quarter of posterior surface of fibula, soleal line, medial border of tibia

soleus insertion

posterior surface of calcaneus via calcaneal tendon

soleus nerve

tibial nerve (S1-S2)

soleus action

ankle plantarflexion, ankle joint stabilization

soleus perfusion

plantaris origin

inferior lateral supracondyler line of femur, oblique popliteal ligament

plantaris insertion

posterior surface of calcaneus via calcaneal tendon

plantaris nerve

tibial nerve (S1-S2)

plantaris action

proprioception, weak ankle plantarflexion

plantaris perfusion

flexor hallucis longus origin

inferior two thirds of posterior surface of fibula, inferoposterior part of interosseous membrane

flexor hallucis longus insertion

base of distal phalanx of hallux

flexor hallucis longus nerve

tibial nerve (S2-S3)

flexor hallucis longus action

hallux MTP and IP joint flexion, weak ankle plantarflexion, support medial longitudinal arch of foot

flexor hallucis longus perfusion

flexor digitorum longus origin

medial posterior surface of tibia, inferior to soleal line, broad tendon to fibula

flexor digitorum longus insertion

base of distal phalanges of digits 2-5

flexor digitorum longus nerve

tibial nerve (S2-S3)

flexor digitorum longus action

MTP, PIP, and DIP joint flexion for digits 2-5, ankle plantarflexion, support longitudinal arches of foot

flexor digitorum longus perfusion

tibialis posterior origin

posterior interosseous membrane, posterior surface of tibia, inferior to soleal line, posterior surface of fibula

tibialis posterior insertion

navicular tuberosity, cuneiforms, cuboid, based of metatarsals 2-4

tibialis posterior nerve

tibial nerve (L4-L5)

tibialis posterior action

ankle plantarflexion, foot inversion, support medial longitudinal arch of foot