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Muscles: foot/ankle
Lippert - ch. 20 foot & ankle muscles
| Question | Answer |
|---|---|
| gastrocnemius: ORIGIN | medial & lateral condyles of femur |
| gastrocnemius: INSERTION | posterior calcaneus |
| gastrocnemius: ACTION | knee flexion; ankle plantar flexion |
| gastrocnemius: NERVE | tibial nerve (S1,S2) |
| soleus: ORIGIN | posterior tibia & fibula |
| soleus: INSERTION | posterior calcaneus |
| soleus: ACTION | ankle plantar flexion |
| soleus: NERVE | tibial nerve (S1,S2) |
| plantaris: ORIGIN | posterior lateral condyle of femur |
| plantaris: INSERTION | posterior calcaneus |
| plantaris: ACTION | weak assistance in knee flexion & ankle plantar flexion |
| plantaris: NERVE | tibial nerve (L4,L5,S1) |
| tibialis posterior: ORIGIN | interosseous membrane, adjacent tibis & fibula |
| tibialis posterior: INSERTION | navicular & most tarsals & metatarsals |
| tibialis posterior: ACTION | ankle inversion ; assists in plantar flexion |
| tibialis posterior: NERVE | tibial nerve (L5,S1) |
| flexor hallucis longus: ORIGIN | posterior fibula & interosseous membrane |
| flexor hallucis longus: INSERTION | distal phalanx of great toe |
| flexor hallucis longus: ACTION | flexes great toe; assists in inversion & plantarflexion of ankle |
| flexor hallucis longus: NERVE | tibial nerve (L5, S1,S2) |
| flexor digitorum longus: ORIGIN | posterior tibia |
| flexor digitorum longus: INSERTION | distal phalanx of 4 lesser toes |
| flexor digitorum longus: ACTION | flexes the 4 lesser toes; assists in ankle inversion & plantarflexion |
| flexor digitorum longus: NERVE | tibial nerve (L5, S1) |
| tibialis anterior: ORIGIN | lateral tibia & interosseous membrane |
| tibialis anterior: INSERTION | 1st cuneiform & 1st metatarsal |
| tibialis anterior: ACTION | ankle inversion & dorsiflexion |
| tibialis anterior: NERVE | deep peroneal nerve (L4, L5, S1) |
| extensor hallucis longus: ORIGIN | fibula & interosseous membrane |
| extensor hallucis longus: INSERTION | distal phalanx of great toe |
| extensor hallucis longus: ACTION | extends 1st toe; assists in ankle inversion & dorsiflexion |
| extensor hallucis longus: NERVE | deep peroneal nerve (L4, L5, S1) |
| extensor digitorum longus: ORIGIN | fibula, interosseous membrane, tibia |
| extensor digitorum longus: INSERTION | distal phalanx of 4 lesser toes |
| extensor digitorum longus: ACTION | extends 4 lesser toes, assists in ankle dorsiflexion |
| extensor digitorum longus: NERVE | deep peroneal nerve (L4, L5, S1) |
| peroneus longus: ORIGIN | lateral proximal fibula & interosseous membrane |
| peroneus longus: INSERTION | plantar surface of 1st cuneiform & metatarsal |
| peroneus longus: ACTION | ankle eversion; assists in ankle plantar flexion |
| peroneus longus: NERVE | superficial peroneal nerve (L4, L5, S1) |
| peroneus brevis: ORIGIN | lateral distal fibula |
| peroneus brevis: INSERTION | base of 5th metatarsal |
| peroneus brevis: ACTION | ankle eversion; assists in plantar flexion |
| peroneus brevis: NERVE | superficial peroneal nerve (L4, L5, S1) |
| peroneus tertius: ORIGIN | distal medial fibula |
| peroneus tertius: INSERTION | base of 5th metatarsal |
| peroneus tertius: ACTION | assists somewhat in ankle eversion & dorsiflexion |
| peroneus tertius: NERVE | deep peroneal nerve (L4, L5, S1) |
| Which peroneous muscle is not present in all people? | Peroneus tertius |