Hamstrings

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Author:
jcandyj_80alba
ID:
204777
Filename:
Hamstrings
Updated:
2013-03-03 22:50:49
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Hamstrings
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Description:
Hamstrings
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  1. Hamstring muscles are
    • biceps femoris
    • semitendinosus
    • semimbranosus
  2. hamstrings as a functional group does what action
    • flexs knee (knee flexors)
    • extension at hip joint (hip extensors)
  3. origin of biceps femoris
    • long head: originates at ischial tuberosity
    • short head: originates at lateral lip of linea aspera
  4. Insertions of biceps femoris
    head of the fibula
  5. Action of biceps femoris
    • flex the knee
    • laterally rotate the lexed knee
    • Long head: extend the hip and
    • assist to laterally rotate the hip

    tilt the pelvis posteriorly
  6. Nerve that innervates biceps femoris
    • long head: sciatic (tibial branch) L5, S1-3
    • Short head: Sciatic (peroneal branch) L5, S1-2
  7. Origin of semitendinosus
    ischial tuberosity
  8. insertion of semitendinsus
    proximal, medial shaft of the tibia at pes anserinus tendon
  9. action of semitendinosus
    • flex the knee
    • medially rotate the flexed knee
    • extend the hip
    • assist to medially rotate the hip
    • tilt pelvis posteriorly
  10. nerve that innervates the semitendinosus
    sciatic (tibial branch) L4,5, S1,2
  11. Origin of semimembranosus
    ischial tuberosity
  12. Insertion of semimembranosus
    posterior aspect of medial condyle of tibia
  13. action of semimembranosus
    • flex the knee
    • medially rotate the flexed knee
    • extend the hip
    • assist to medially rotate the hip
    • tilt pelvis posteriorly
  14. nerve that innervates the semimembranosus
    sciatic (tibial branch) L4,5, S1,2
  15. the hamstrings are a major stablizer of of joint
    knee
  16. which two hamstring group act as a unit
    semitendinosus and semimembranosus act as a unit

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