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