Muscle Anatomy of the Lower Leg

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10 Terms

1
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Tibialis Anterior

Origin: lateral condyle of tibia; Insertion: base of metatarsal 1, medial cuneiform; Action: dorsiflexion, inversion of foot; Innervation: deep peroneal nerve.

2
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Extensor Digitorum longus

Origin: lateral condyle of tibia; Insertion: distal phalanges of digits 2-5; Action: extends digits 2-5, dorsiflexion of foot; Innervation: deep peroneal nerve.

3
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Extensor hallucis longus

Origin: anterior surface of fibula; Insertion: dorsal surface of digit 1 (great toe); Action: extension of digit 1, dorsiflexion of foot; Innervation: deep peroneal nerve.

4
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Peroneus Brevis

Origin: lateral, distal fibula; Insertion: lateral side of 5th metatarsal; Action: plantarflex and evert foot (pronate); Innervation: superficial peroneal nerve.

5
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Peroneus Longus

Origin: posterior surface of tibia, superior fibula; Insertion: base of metatarsal 1; Action: plantarflex and evert foot (pronate); Innervation: superficial peroneal nerve.

6
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Gastrocnemius

Origin: medial and lateral heads: posterior surfaces of medial and lateral femoral condyles; Insertion: posterior surface of calcaneus via Achilles tendon; Action: plantarflexion of foot, knee flexion; Innervation: tibial nerve.

7
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Soleus

Origin: posterior surface of fibula, medial region of posterior tibia; Insertion: posterior surface of calcaneus via Achilles tendon; Action: plantarflexion of foot; Innervation: tibial nerve.

8
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Tibialis Posterior

Origin: posterior surface of tibia, interosseous membrane, medial surface of fibula; Insertion: navicular bone, cuneiforms (3), cuboid, and metatarsals 2-4; Action: plantarflexion, inversion and adduction of foot; Innervation: tibial nerve.

9
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Flexor digitorum longus

Origin: posterior surface of tibia; Insertion: inferior surface of distal phalanges 2-5; Action: flexion of digits 2-5; inversion and plantarflexion of foot; Innervation: tibial nerve.

10
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Flexor hallucis longus

Origin: posterior fibula; Insertion: inferior surface of distal phalanx of digit 1 (great toe); Action: flexion of digit 1, inversion and plantarflexion of foot; Innervation: tibial nerve.