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Lower Leg Compartments (Tibial Nerve (Posterior Superficial Group…
Lower Leg Compartments
Tibial Nerve
Posterior Superficial Group
Gastrocnemius
Actions: plantarflexes ankle when knee is extended; flexes leg at knee joint
Soleus
Actions: plantarflexes ankle independent of knee position
Plantaris
Actions: weakly assists gastrocnemius in plantarflexing ankle
Posterior Deep Group
Tibialis posterior
Actions: plantarflexes ankle; inverts foot
Flexor hallucis longus
Actions: flexes great toe; supports medial longitudinal arch of foot
Flexor digitorum longus
Actions: flexes lateral four digits; plantarflexes ankle; supports longitudinal arches of foot
Common Fibular Nerve
Anterior Group (Innervation: deep fibular n.)
Tibialis anterior
Actions: dorsiflexes ankle and inverts foot
Extensor hallucis longus
Actions: extends great toe and dorsiflexes ankle
Extensor digitorum longus
Actions: extends lateral four digits and dorsiflexes ankle
Fibularis tertius
Actions: dorsiflexes ankle and aids in eversion of foot
Lateral Group (Innervation: superficial fibular n.)
Fibularis longus
Actions: everts foot and weakly plantarflexes ankle
Fibularis brevis
Actions: everts foot and weakly plantarflexes ankle