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Muscles of the Leg Anterior Compartment • • • • Tibialis anterior muscle Extensor hallucis longus muscle Extensor digitorum longus muscle Fibularis (peroneus) tertius muscle • All supplied by the deep fibular nerve Tibialis anterior muscle • L4, L5 • DF • Inversion Extensor Hallucis Longus muscle • L5, S1 • Extends big toe • Assists dorsiflexion of ankle • Weak ankle inversion Extensor Digitorum Longus muscle • L5, S1 • Extends lateral four toes • Ankle dorsiflexion • Everts the foot at the subtalar joints Fibularis tertius muscle • Not seen in all people • L5,s1 • Ankle eversion at subtalar joint • DF of foot at ankle joint Lateral Compartment Muscles • Fibularis longus muscle • Fibularis brevis muscle • Both innervated by the superficial fibular nerve, L5, S1, • Both have actions of: – Plantar flexion of ankle – Eversion of ankle Fibularis longus muscle • Common fibular nerve • Superficial fibular nerve Fibularis brevis muscle Posterior Leg Muscles • Which nerve? • Superficial posterior muscles – Gastrocnemius muscle – Soleus muscle – Plantaris muscle • Deep posterior muscles – – – – Popliteus muscle Flexor digitorum longus muscle Flexor hallucis longus muscle Tibialis posterior muscle Gastrocnemius muscle • S1, S2 • PF ankle • Flexes leg at knee • Inverts the foot at the subtalar joints Soleus muscle • S1, S2 • PF ankle • Postural muscle • Inverts the foot at the subtalar joints Plantaris muscle • S1, S2 • Weak PF • Weak knee flexion • Inverts the foot at the subtalar joints Popliteus muscle • L4, L5, S1 • Flexes knee • Medially rotates the leg at the knee in open chain • Laterally rotates the femur at the knee in closed chain Flexor digitorum longus muscle • L5, S1, S2 • Flexes lateral 4 toes – Primarily distal phalanx • PF ankle • Assists inversion of the foot at the subtalar joints Flexor hallucis longus muscle • L5, S1, S2 • Flexes distal phalanx of big toe • PF ankle • Inversion of foot at subtalar joints • Note relationship of FDL and FHL Tibialis posterior muscle • L4, L5 • PF • Inverts foot • Supports arch of foot Muscle Hints • Tibialis *** muscles – Common action: – Common spinal level: • Fibularis *** muscle – Common action: • All Anterior and Lateral compartment muscles EXCEPT for Tibialis ant. muscle – Common Spinal level: • Superficial Post. Comp. muscles – Common spinal level: • Toe flexor muscles – Common spinal level – Common actions: • Popliteus muscle – Spinal levels:
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