Popliteus (L5) - Anatomy

Origin	Anterior part of the popliteal groove on lateral surface of lateral femoral condyle
Insertion	Posterior surface of tibia in a fan-like fashion, just superior to the popliteal line
Action	Internally rotates tibia relative to femur and unlocks knee during knee flexion initiation
Innervation	Tibial nerve (L4, L5, S1) (L4, L5, S1)
Arterial Supply	Medial inferior genicular branch of popliteal artery and muscular branch of posterior tibial artery