Lower Extremities: Muscles That Act On The Leg

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Author:
nhorn1017
ID:
4392
Filename:
Lower Extremities: Muscles That Act On The Leg
Updated:
2010-01-17 23:13:11
Tags:
muscles
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Description:
Lower Extremities: Muscles That Act On The Leg
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  1. Rectus Femoris
    • Location- on center of anterior surface of femur
    • Origin- anterior inferior iliac spine and superior margin of acetabulum
    • Insertion- base of patella and tibial tuberosity
    • Action- extends the leg at the knee
  2. Vastus Lateralis
    • Location- lateral and posterior to rectus femoris
    • Origin- greater trochanter and posterior surface of femur (linea aspera)
    • Insertion- base of patella and tibial tuberosity
    • Action- extends the leg at the knee
  3. Vastus Medialis
    • Location- medial and posterior to rectus femoris
    • Origin- medial surface of femur
    • Insertion- base of patella and tibial tuberosity
    • Action- extends the leg at the knee
  4. Vastus Intermedius
    • Location- center of thigh behind rectus femoris
    • Origin- anterior and lateral surface of proximal femur shaft
    • Insertion- base of patella and tibial tuberosity
    • Action- extends leg at the knee
  5. Biceps Femoris
    • Location- posterior lateral surface of thigh
    • Origin- ischial tuberosity and linea aspera of femur
    • Insertion- head of fibula and lateral condyle of femur
    • Action- flexes the leg at the knee
  6. Semitendinosus
    • Location- posterior thigh, medial to biceps femoris
    • Origin- ischial tuberosity
    • Insertion- medial surface of tibia
    • Action- flexes leg at knee
  7. Semimembranosus
    • Location- lies underneath the biceps femoris and semitendinosus
    • Origin- ischial tuberosity
    • Insertion- medial condyle of tibia
    • Action- flexes leg at knee
  8. Sartorius
    • Location- passes diagonally across anterior thigh
    • Origin- anterior superior iliac spine
    • Insertion- medial portion of proximal tibia
    • Action- flexes leg at knee

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