foot

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Author:
jtsterner
ID:
3459
Filename:
foot
Updated:
2009-12-22 21:33:59
Tags:
foot muscles
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Description:
Origin, Insertion, Innervation & Function
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  1. Extensor Digitorum Brevis
    O -Superolateral surface of the calcaneus

    I -Base of proximal phalanx of great toe and lateral sides of the tendons of extensor digitorum longus of toes II to IV

    In -Deep fibular nerve [S1, S2]

    F -Extension of metatarsophalangeal joint of great toe and extension of toes II to IV
  2. Abductor Hallucis
    O -Medial process of calcaneal tuberosity

    I -Medial side of base of proximal phalanx of great toe

    In -Medial plantar nerve from the tibial nerve [S1, S2, S3]

    F -Abducts and flexes great toe at metatarsophalangeal joint
  3. Flexor Digitorum Brevis
    O -Medial process of calcaneal tuberosity and plantar aponeurosis

    I -Sides of plantar surface of middle phalanges of lateral four toes

    In -Medial plantar nerve from the tibial nerve [S1, S2, S3]

    F -Flexes lateral four toes at proximal interphalangeal joint
  4. Abductor Digiti Minimi
    O -Lateral and medial processes of calcaneal tuberosity, and band of connective tissue connecting calcaneus with base of metatarsal V

    I -Lateral side of base of proximal phalanx of little toe

    In -Lateral plantar nerve from the tibial nerve [S1, S2, S3]

    F -Abducts little toe at the metatarsophalangeal joint
  5. Quadratus Plantae
    O -Medial surface of calcaneus and lateral process of calcaneal tuberosity

    I -Lateral side of tendon of flexor digitorum longus in proximal sole of the foot

    In -Lateral plantar nerve from tibial nerve [S1, S2, S3]

    F -Assists flexor digitorum longus tendon in flexing toes II to V
  6. Lumbricals
    • O -First lumbrical-medial side of tendon of flexor digitorum longus associated with toe II;
    • -Second, third, and fourth lumbricals-adjacent surfaces of adjacent tendons of flexor digitorum longus

    I -Medial free margins of extensor hoods of toes II to V

    • In -First lumbrical-medial plantar nerve from the tibial nerve;
    • -Second, third, and fourth lumbricals-lateral plantar nerve from the tibial nerve [S2, S3]

    F -Flexion of metatarsophalangeal joint and extension of interphalangeal joints
  7. Flexor Hallucis Brevis
    O -Plantar surface of cuboid and lateral cuneiform; tendon of tibialis posterior

    I -Lateral and medial sides of base of proximal phalanx of the great toe

    In -Medial plantar nerve from tibial nerve [S1, S2]

    F -Flexes metatarsophalangeal joint of the great toe
  8. Flexor Digiti Minimi Brevis
    O -Base of metatarsal V and related sheath of fibularis longus tendon

    I -Lateral side of base of proximal phalanx of little toe

    In -Lateral plantar nerve from tibial nerve [S2, S3]

    F -Flexes little toe at metatarsophalangeal joint
  9. Adductor Hallucis
    • O -Transverse head-ligaments associated with metatarsophalangeal joints of lateral three toes;
    • - Oblique head-bases of metatarsals II to IV and from sheath covering fibularis longus

    I -Lateral side of base of proximal phalanx of great toe

    In -Lateral plantar nerve from tibial nerve [S2, S3]

    F -Adducts great toe at metatarsophalangeal joint
  10. Dorsal Interossei
    O -Sides of adjacent metatarsals

    I -Extensor hoods and bases of proximal phalanges of toes II to IV

    • In -Lateral plantar nerve from tibial nerve;
    • -First and second dorsal interossei also innervated by deep fibular nerve [S2, S3]

    F -Abduction of toes II to IV at metatarsophalangeal joints; resist extension of metatarsophalangeal joints and flexion of interphalangeal joints
  11. Plantar Interossei
    O -Medial sides of metatarsals of toes III to V

    I -Extensor hoods and bases of proximal phalanges of toes III to V

    In -Lateral plantar nerve from tibial nerve [S2, S3]

    F -Adduction of toes III to V at metatarsophalangeal joints; resist extension of the metatarsophalangeal joints and flexion of the interphalangeal joints

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