Leg muscles

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Author:
mfawcett
ID:
125189
Filename:
Leg muscles
Updated:
2011-12-28 11:24:13
Tags:
leg muscle muscles nerve supply action
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Description:
Origins, insertions, actions and nerve supply of leg muscles
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  1. Tibialis anterior
    • - Upper part of lateral tibial surface and interosseous membrane
    • --> medial cuneiform and 1st metatarsal
    • - Deep branch of common fibular nerve
    • - Dorsiflexion and inversion
  2. Extensor hallucis longus
    • - Anteromedial aspect of fibula (middle 1/3) and interosseous membrane
    • --> base of distal phalanx of hallux
    • - Deep branch of common fibular nerve
    • - Extension of hallux, weak dorsiflexion of ankle
  3. Extensor digitorum longus
    • - Upper 2/3 of anteromedial aspect of fibula and interosseous membrane
    • --> bases of middle and distal phalanges of four lesser toes
    • - Deep branch of common fibular nerve
    • - Extension of toes, weak dorsiflexion of ankle
  4. Fibularis tertius
    • - Originates from tendon of EDL
    • --> Dorsal surface of base of 5th metatarsal
    • - Deep branch of common fibular nerve
    • - Dorsiflexes ankle, everts foot
  5. Fibularis longus
    tendon goes?
    supports?
    • - Upper part of lateral aspect of fibular shaft
    • Tendon passes behind lateral malleolus, grooves cuboid crossing sole obliquely
    • --> Medial cuneiform and base of 1st metatarsal
    • - Superficial branch of common fibular nerve
    • - Everts foot, weak plantarflexor
    • Supports lateral longitudinal and transverse arches
  6. Fibularis brevis
    • - Lower part of lateral aspect of fibular shaft
    • --> tuberosity at base of 5th metatarsal
    • - Superficial branch of common fibular nerve
    • - Everts foot, weak plantarflexor
  7. Gastrocnemius
    • - Lateral head: lateral aspect of lateral condyle
    • - Medial head: proximal to medial condyle
    • --> calcaneal tendon into posterior aspect of calcaneus
    • - Tibial nerve
    • - Strong planter flexor, weak flexor of knee
  8. Plantaris
    • - Distal end of lateral supracondylar ridge of femur
    • --> with calcaneal tendon
    • - Tibial nerve
  9. Soleus
    also important as?
    • - Upper 1/4 of posterior aspect of fibula, soleal line of tibia, middle 1/3 of medial border of tibia
    • --> calcaneal tendon
    • - Tibial nerve
    • - Planter flexor - multipennate
    • - Important venous pump - perforating veins from great sapenous enter it
  10. Popliteus
    • - Lateral head: round tendon from anterior end of popliteal groove on lateral femoral condyle
    • - Medial head: flat aponeurosis attached to lateral meniscus and capsule
    • --> Popliteal surface of posterior tibia above soleal line
    • - Tibial nerve
    • - Stabilises and controls position of lateral meniscus, 'unlock's the knee on initiation of movement (by rotating femur laterally)
  11. Flexor hallucis longus
    • - Distal 3/4 of fibular and interosseous membrane
    • Tendon grooves talus and inferior surface of sustentaculum tali of calcaneus
    • --> Plantar surface of base of distal phalanx of hallux
    • - Tibial nerve
    • - Flexes hallux, maintains medial longitudinal arch of foot in movement
  12. Flexor digitorum longues
    • - Medial part of posterior surface of tibia
    • Crosses FHL tendon in sole, divides into 4 tendons
    • --> Plantar surfaces of bases of distal phalanx of 4 lateral toes (through decussation from FDB)
    • - Tibial nerve
    • - Flexes toes in walking and running
  13. Tibialis posterior
    • - Posterolateral surface of tibia below soleal line, interosseous membrane, upper part of medial aspect of fibula
    • --> Tuberosity of navicular, slips to cuboid, cuneiforms, bases of medial 4 metatarsals
    • - Tibial nerve
    • - Flexes and inverts foot

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