The knee Joint Muscles Kinesiology

Rectus Femoris Muscle Action

Flexion of hip

Extension of knee

Rectus Femoris Muscle Origin

Anterior inferior iliac spine

Rectus Femoris Muscle Insertion

Groove above the acetabulum

Vastus Lateralis Muscle Action

Extension of knee

Vastus Lateralis Muscle Origin

Intertrochanteric Line, anterior and inferior borders of the greater trochanter, upper half of the linea aspera and the entire lateral intermuscular septum

Vastus Lateralis Muscle Insertion

Lateral border of patella, patellar tendon to tibial tuberosity

Vastus Intermedius Muscle action

Extension of knee

Vastus Intermedius Muscle origin

Upper two-thirds of anterior surface

Vastus Intermedius Muscle insertion

Upper border of patella and the patellar tendon to tibial tuberosity

Vastus Medialis Muscle Action

Extension of knee

Vastus Medialis Muscle Origin

Whole length of the linea aspera and medial condyloid ridge

Vastus Medialis Muscle Insertion

Medial half of the upper border of the patella and patellar tendon to the tibial tuberosity

Hamstring muscle group

Semitendinosus

Biceps femoris

Semimembranosus

Semitendinosus Muscle action

Flexion of knee

Extension of hip

Internal rotation of hip

Semitendinosus Muscle origin

Ischial tuberosity

Semitendinosus Muscle Insertion

Upper anterior medial surface of the tibia

Semimembranosus Muscle Action

Flexion of knee

Extension of hip

Internal rotation of hip

Semimembranosus Muscle Origin

Ischial tuberosity

Semimembranosus Muscle Insertion

Posteromedial surface of the medial tibial condyle

Biceps Femoris Muscle Action

Flexion of knee

Extension of hip

External rotation of hip

Biceps Femoris Muscle Origin

Ischial tuberosity. And the lower half of the linea aspera, lateral condyloid ridge

Biceps Femoris Muscle Insertion

Lateral Condyle of tibia, head of fibula

Popliteus Muscle Action

Flexion of knee

Internal rotation of flexed knee

Popliteus Muscle Origin

Posterior surface of the lateral condyle of the femur

Popliteus Muscle Insertion

Upper posterior medial surface of the tibia