Knee functional anatomy

1. What are the knee extensors?
2. What are the knee flexors?
3. What are the knee medial rotators?
4. What are the knee lateral rotators?
5. What is the function and innervation of the popliteus?

Answers:
1. Quadriceps.
2. Lateral and medial hamstrings, sartorius, gracilis, gastrocnemius.
3. Medial hamstrings, sartorius, gracilis.
4. Biceps femoris.
5. The popliteus locks and unlocks the knee. It is innervated by the tibial nerve (L4, L5, S1).