Muscles of the Hip, Thign & Knee

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Author:
msviolet_26
ID:
92295
Filename:
Muscles of the Hip, Thign & Knee
Updated:
2011-06-28 15:05:00
Tags:
muscles hip thigh knee
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Description:
origin, insertion, action, nerve supply
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  1. Sartorius
    • O: anterior superior iliac spine, area immediately below
    • I: anteromedial aspect proximal end shaft of tibia
    • N: femoral nerve L2,L3
    • A: flexes hip & knee abducts & laterally rotates thigh

    *Reversed O-I action: When femur and knee are fixed, flexes the pelvis on the hip and gives anterior stabilization to the pelvis.
  2. Gracilis
    • O: lower medial margin of body and inferior ramus of pubis,adjacent inf. ramus of ischium
    • I: anteromedial aspect proximal end of shaft of tibia
    • N: obturator nerve L2,L3
    • A: adducts thigh; flexes leg; helps medially rotate leg

    * Reversed O-I action: When the thigh is fixed, flexes the pelvis at hip
  3. Biceps Femoris
    • O: long head – ischial tuberosity, sacrotuberous ligament; short head – lateral lip linea aspera, lateral supercondylar ridge, (lateral intermuscular septum)
    • I: head of fibula (lateral aspect),fibular collateral ligament,lateral condyle of tibia
    • N: long head – tibial nerve, a branch of sciatic L5,S1,S2; short head – common peroneal nerve a division of sciatic L5,S1,S2
    • A: extends hip (long head)flexes knee (short head)lateral rotation leg (both)

    * Reversed O-I action: The long head gives posterior stability to the pelvis and extends the pelvis on the hip.
  4. Semitendinosus
    • O: ischial tuberosity
    • I: anteromedial surface proximal end of tibia
    • N: tibial nerve L5,S1,S2 a branch of sciatic nerve
    • A: extends hip; flexes knee; medial rotation leg


    * Reveresed O-I action: The thigh is fixed, assists [psteropr stability of the pelvis and extends the pelvis on the hip.
  5. Semimembranosus
    • O: ischial tuberosity
    • I: posterior superior medial condyle of tibia
    • N: tibial nerve L5,S1,S2
    • A: extends hip; flexes knee; medial rotation leg

    * Reversed O-I action: When the thigh is fixed, gives posterior stability to the pelvis and extends the pelvis on the hip.
  6. Rectus Femoris
    • O: anterior inferior iliac spine; groove or rim of acetabulum
    • I: base of patella and tibial tuberosity via ligamentum patella
    • N: femoral nerve L2,L3,L4
    • A: flexes hip; extends knee

    *Reversed O-I action: Flexes the pelvis on the femus and gives anterior stabilization on the pelvis
  7. Vastus Lateralis
    • O: lateral lip of linea aspera; greater trochanter(lateral intermuscular septum)
    • I: lateral border of patella and tibial tuberosity via ligamentum patella
    • N: femoral nerve L2,L3,L4
    • A: extends knee
  8. Vastus Medialis
    • O: medial lip of linea aspera; medial supercondylar line; intertrochanteric line(medial intermuscular septum)
    • I: medial border of patella and tibial tuberosity via ligamentum patella
    • N: femoral nerve L2,L3,L4
    • A: extends knee
  9. Vastus Intermedius
    • O: anterior and lateral surface of upper 2/3 femur, linea aspera(lateral intermuscular septum)
    • I: lateral border of patella and tibial tuberosity via ligamentum patella
    • N: femoral nerve L2,L3,L4
    • A: extends knee
  10. Popliteus
    • O: lateral aspect of lateral condyle of femur and lateral meniscus
    • I: posterior aspect tibia, proximal to soleal line
    • N: tibial nerve L4,L5,S1
    • A: medial rotation tibia on femur (when stationary) (lat. rotation femur when tibia stationary)weak knee flexor

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