test 4 posterior leg Flashcards
superficial posterior leg muscles
- Gastrocnemius
- Soleus
- Plantaris
Gastrocnemius: Lateral head (LG) origin
Lateral aspect of lateral condyle of femur
Gastrocnemius: Lateral head (LG) insertion
Posterior surface of calcaneus via calcaneal tendon
Gastrocnemius: Lateral head (LG) innervation
Tibial nerve (S1, S2)
Gastrocnemius: Lateral head (LG) action
Plantarflexes ankle when knee is extended; raises heel during walking, and flexes leg at knee joint
Gastrocnemius: Medial head (MG) origin
popliteal surface of femur, superior to medial condyle
Gastrocnemius: Medial head (MG) insertion
Posterior surface of calcaneus via calcaneal tendon
Gastrocnemius: Medial head (MG) innervation
Tibial nerve (S1, S2)
Gastrocnemius: Medial head (MG) action
Plantarflexes ankle when knee is extended; raises heel during walking, and flexes leg at knee joint
Soleus (SOL) origin
Posterior aspect of head of fibula, superior quarter of posterior surface of fibula, soleal line, and medial border of tibia
Soleus (SOL) insertion
Posterior surface of calcaneus via calcaneal tendon
Soleus (SOL) innervation
Tibial nerve (S1, S2)
Soleus (SOL) action
Plantarflexes ankle; steadies leg on foot
Plantaris (P) origin
Inferior end of lateral supracondylar line of femur and oblique popliteal ligament
Plantaris (P) insertion
Posterior surface of calcaneus via calcaneal tendon
Plantaris (P) innervation
Tibial nerve (S1, S2)
Plantaris (P) action
Plantarflexes ankle; steadies leg on foot
Deeep posterior leg muscles
- Popliteus
- Flexor Hallucis Longus
- Flexor Digitorum Longus
- Tibialis Posterior
Popliteus origin
Lateral surface of lateral condyle of femur and lateral meniscus
Popliteus insertion
Posterior surface of tibia, superior to soleal line
Popliteus innervatio
Tibial nerve (L4, L5, S1)
Popliteus action
Weakly flexes knee and unlocks it by laterally rotating femur on fixed tibia, or medially rotating tibia of unplanted limb
Flexor hallucis longus (FHL) origin
Inferior two thirds of posterior surface of fibula and inferior part of interosseous membrane
Flexor hallucis longus (FHL) insertion
Base of distal phalanx of great toe (hallux)
Flexor hallucis longus (FHL) innervation
Tibial nerve (S2, S3)
Flexor hallucis longus (FHL) action
Flexes great toe at all joints; weakly plantarflexes ankle; supports medial longitudinal arch of foot
Flexor digitorum longus (FDL) origin
Medial part of posterior surface of tibia inferior to soleal line and by a broad tendon to fibula
Flexor digitorum longus (FDL) insertion
Bases of distal phalanges of lateral four digits
Flexor digitorum longus (FDL) innervation
Tibial nerve (S2, S3)
Flexor digitorum longus (FDL) action
Flexes lateral four digits; plantarflexes ankle; supports longitudinal arches of foot
Tibialis posterior (TP) origin
Interosseous membrane, posterior surface of tibia inferior to soleal line, and posterior surface of fibula
Tibialis posterior (TP) insertion
Primarily to tuberosity of navicular; also to cuneiforms, cuboid and bases of 2nd–4th metatarsals
Tibialis posterior (TP) innervation
Tibial nerve (L4, L5)
Tibialis posterior (TP) action
Plantarflexes ankle; inverts foot; supports medial longitudinal arch of foot
