PEDS100 Chapter Notes -Ischial Tuberosity, Biceps Femoris Muscle, Quadriceps Femoris Muscle

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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: crossing legs with foot on thigh
O: Anterior superior iliac spine
I: Medial surface of tibia near tibial tuberosity
A: Flexion at knee. Abduction, flexion, lateral rotation at hip
Popliteus:
O: Lateral condyle of femur
I: Posterior surface of proximal tibial shaft
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