Muscles of the Leg and Feet

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Author:
msviolet_26
ID:
92304
Filename:
Muscles of the Leg and Feet
Updated:
2011-06-28 16:35:30
Tags:
muscles leg feet
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Description:
origin, insertion, action , nerve supply
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  1. Tibialis Anterior
    • O: lateral condyle & proximal ½of lateral aspect shaft of tibia,interosseous membrane
    • I: medial & inferior aspect of medial cuneiform, base of 1stmetatarsal
    • N: deep peroneal n. L4,L5
    • A: inverts and dorsiflexes foot

    *Reversed O-I action: When standing, the foot is fixed and becomes the origin. Action causes forward body lean antagonistic to the plantar flexion of the soleus and gastrocnemius. Active in the balance mechanism of anterior and posterior sway.
  2. Extensor Digitorum Longus
    • O: lateral condyle of tibia,proximal ¾ medial aspect of fibula,interosseous membrane
    • I: dorsal aspect base of middle & distal phalanges of lateral 4 digits, extensor expansion
    • N: deep peroneal n. L5,S1
    • A: extends lat. 4 digits; dorsiflexes ankle
  3. Extensor Hallucis Longus
    • O: anterior aspect fibula (mid),interosseous membrane
    • I: dorsal aspect base of distal phalanx of big toe
    • N: deep peroneal n. L5,S1
    • A: extends big toe ; dorsiflexes ankle
  4. Peroneus Tertius
    • O: inferior 1/3 ant. aspect of fibula, interosseous membrane
    • I: dorsal aspect base of 5th metatarsal
    • N: deep peroneal n. L5,S1
    • A: dorsiflexes ankle; aids in eversion of ankle
  5. Peronius Longus
    • O: head & proximal 2/3 lateral aspect of fibula
    • I: lateral aspect base of 1st metatarsal, medial cuneiform
    • N: superficial peroneal n. L5,S1,S2
    • A: everts foot; plantarflexes ankle
  6. Peronius Brevis
    • O: distal 2/3 lateral aspect of fibula
    • I: tubercle of base of 5th metatarsal
    • N: superficial peroneal n. L5,S1,S2
    • A: everts foot; plantarflexes ankle
  7. Gastrocnemius
    • O: lateral head: lateral condyleof femur & adj. supracondylar line; medial head: popliteal surface of femur,medial condyle of femur
    • I: posterior aspect of calcaneus via tendo calcaneus
    • N: tibial n. S1,S2
    • A: flexes knee; plantarflexes ankle when kneeis extended

    *Reversed O-I action: Flexes leg at the knee. Dorsiflexion of foot increases knee flexion capability.
  8. Soleus
    • O: posterior aspect of head offibula,proximal 1/4th of shaft of fibula,soleal line,middle 1/3 medial border oftibia
    • I: posterior aspect of calcaneus via tendo calcaneus
    • N: tibial n. S1,S2
    • A: plantarflexes ankle

    * Reveresed O-I action: When standing, the calcaneus becomes the fixed origin of the muscle. The soleus muscle stabilizes the tibia on the calcaneus limiting forward sway.
  9. Plantaris
    • O: lateral supracondylar line above lateral head of gastrocnemius
    • I: posterior aspect of calcaneus via tendo calcaneus
    • N: tibial n. S1,S2
    • A: weak knee flexor; weak plantarflexor of ankle
  10. Flexor Digitorum Longus
    • O: posterior aspect of tibiai, nferior to soleal line
    • I: plantar aspect bases of distal phalanges of 4 lateral toes
    • N: tibial n. S2,S3
    • A: flexes lateral 4 toes; plantarflexes ankle
  11. Flexor Hallucis Longus
    • O: distal 2/3rds posterior surface fibula,interosseous membrane
    • I: plantar aspect base of distal phalanx of big toe
    • N: tibial n. S2,S3
    • A: flexes big toe; weak plantarflexor
  12. Tibialis Posterior
    • O: proximal 2/3 of tibia below soleal line,interosseous membrane,proximal 2/3 of fibula
    • I: tuberosity of navicular,1st, 2nd and 3rd cuneiforms,cuboid,base of 2nd, 3rd & 4th metatarsals,sustentaculum tali
    • N: tibial n. L4,L5
    • A: inverts ankle; plantarflexes foot

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