Synergist of the Knee

Question 1

Extension

Answer 1

1. Rectus femoris
   
   2. Vastus lateralis
   3. Vastus medialis
   4. Vastus intermedius

Question 2

Flexion

Answer 2

1. Biceps femoris
   
   2. Semitendinosus
   3. Semimembranosus
   4. Gracilis
   5. Sartorius
   6. Gastrocnemius
   7. Popliteus
   8. Plantaris (weak)

Question 3

Medial Rotation of Flexed Knee

Answer 3

1. Semitendinosus
   
   2. Semimembranosus
   3. Gracilis
   4. Sartorius
   5. Popliteus

Question 4

Lateral Rotation of Flexed Knee

Answer 4

1. Biceps femoris