lower leg

Card Set Information

Author:
jtsterner
ID:
3457
Filename:
lower leg
Updated:
2009-12-22 21:17:37
Tags:
lower leg muscles
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Description:
Origin, Insertion, Innervation & Function
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  1. Gastrocnemius
    • O -Medial head-posterior surface of distal femur just superior to medial condyle;
    • -Lateral head-upper posterolateral surface of lateral femoral condyle

    I -Via calcaneal tendon, to posterior surface of calcaneus

    In -Tibial nerve [S1, S2]

    F -Plantarflexes foot and flexes knee
  2. Plantaris
    O -Inferior part of lateral supracondylar line of femur and oblique popliteal ligament of knee

    I -Via calcaneal tendon, to posterior surface of calcaneus

    In -Tibial nerve [S1, S2]

    F -Plantarflexes foot and flexes knee
  3. Soleus
    O -Soleal line and medial border of tibia; posterior aspect of fibular head and adjacent surfaces of neck and proximal shaft; tendinous arch between tibial and fibular attachments

    I -Via calcaneal tendon, to posterior surface of calcaneus

    In -Tibial nerve [S1, S2]

    F -Plantarflexes the foot
  4. Popliteus
    O -Lateral femoral condyle

    I -Posterior surface of proximal tibia

    In -Tibial nerve [L4-S1]

    • F -Stabilizes knee joint (resists lateral rotation of tibia on femur)
    • - Unlocks knee joint (laterally rotates femur on fixed tibia)
  5. Flexor Hallucis Longus
    O -Posterior surface of fibula and adjacent interosseous membrane

    I -Plantar surface of distal phalanx of great toe

    In -Tibial nerve [S2, S3]

    F -Flexes great toe
  6. Flexor Digitorum Longus
    O -Medial side of posterior surface of the tibia

    I -Plantar surfaces of bases of distal phalanges of the lateral four toes

    In -Tibial nerve [S2, S3]

    F -Flexes lateral four toes
  7. Tibialis Posterior
    O -Posterior surfaces of interosseous membrane and adjacent regions of tibia and fibula

    I -Mainly to tuberosity of navicular and adjacent region of medial cuneiform

    In -Tibial nerve [L4, L5]

    F -Inversion and plantarflexion of foot; support of medial arch of foot during walking
  8. Fibularis Longus
    O -Upper lateral surface of fibula, head of fibula, and occasionally the lateral tibial condyle

    I -Undersurface of lateral sides of distal end of medial cuneiform and base of metatarsal I

    In -Superficial fibular nerve [L5, S1, S2]

    F -Eversion and plantarflexion of foot; supports arches of foot
  9. Tibialis Anterior
    O -Lateral surface of tibia and adjacent interosseous membrane

    I -Medial and inferior surfaces of medial cuneiform and adjacent surfaces on base of metatarsal I

    In -Deep fibular nerve [L4, L5]

    F -Dorsiflexion of foot at ankle joint; inversion of foot; dynamic support of medial arch of foot
  10. Fibularis Brevis
    O -Lower two-thirds of lateral surface of shaft of fibula

    I -Lateral tubercle at base of metatarsal V

    In -Superficial fibular nerve [L5, S1, S2]

    F -Eversion of foot
  11. Extensor Hallucis Longus
    O -Middle one-half of medial surface of fibula and adjacent surface of interosseous membrane

    I -Dorsal surface of base of distal phalanx of great toe

    In -Deep fibular nerve [L5, S1]

    F -Extension of great toe and dorsiflexion of foot
  12. Fibularis Tertius
    O -Distal part of medial surface of fibula

    I -Dorsomedial surface of base of metatarsal V

    In -Deep fibular nerve [L5, S1]

    F -Dorsiflexion and eversion of foot
  13. Extensor Digitorum Longus
    O -Proximal one-half of medial surface of fibula and related surface of lateral tibial condyle

    I -Via dorsal digital expansions into bases of distal and middle phalanges of lateral four toes

    In -Deep fibular nerve [L5, S1]

    F -Extension of lateral four toes and dorsiflexion of foot

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