Muscles that move the Leg

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University of Alberta
Physical Education and Sport
Gail Amort- Larson

Muscles that move the Leg -muscles whose action lines pass anterior to axis of knee are extensors of knee (quadriceps femoris) Most extensors originate of femoral surface and extend along anterior and lateral surfaces of thigh -muscles whose action lines pass posterior to axis of knee are flexors of knee (hamstrings) Originate of pelvic girdle and extend along posterior and medial surfaces of thigh Flexors of Knee -all flex knee, extend hip, rotate leg -Adductor magnus works with hamstrings to extend hip -commonly originate on ischial tuberosity -Pes anserinus: bursitis in area where the three hamstring muscles attach Biceps femoris: Part of hamstrings (lateral)(protects sciatic nerve) (flex knee at 90, feel tendon of biceps femoris laterally) O: Ischial tuberosity(long head) and linea aspera of femur(short head) I: Head of fibula, lateral condyle of tibia A: Flexion, lateral rotation at knee. Extension at hip Semimembranosus: Part of hamstrings (medial)(wider muscle, deep to semitendinosus) (flex knee, medial tendon) O: Ischial tuberosity I: Posterior surface of medial condyle of tibia A: Flexion, medial rotation at knee, extension at hip Semitendinosus: Part of hamstrings (long tendon) (medial) (flex knee, prominent tendon medially) O: Ischial tuberosity I: Anterior, medial surface of tibia near insertion of gracilis A: Flexion, medial rotation at knee, extension at hip Sartorius: cro
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