Knee ligaments/muscles origin, insertion, nerve & action

ACL

Resists anterior translation of the tibia to a fixed femur OKC

Resists posterior translation of the femur relative to a fixed tibia CKC

PCL

Resists posterior translation of the tibia relative to a fixed femur OKC

Resists anterior translation of the femur relative to a fixed tibia CKC

MCL

Resists valgus producing forces at the knee

LCL

Resists varus producing forces at the knee

Rectus femoris (origin)

Anterior inferiror iliac spine

Rectus femoris (insertion)

Tibial tuberosity

Rectus femoris (innevation)

Femoral nerve

Rectus femoris (action)

Hip flexion and knee extension

Vastus medialis (origin)

Medial lip of linea aspera and intertrochantric line of the femur

Vastus medialis (innervation)

Femoral nerve

Vastus medialis (action)

Knee extension

Vastus lateralis (origin)

Lateral lip of linea aspera, intertrochantric line and lateral region of the gluteal tuberosity

Vastus lateralis (insertion)

Tibial tubrosity

Vastus lateralis (innervation)

Femoral nerve

Vastus lateralis (action)

Knee extension

Vastus intermedius (origin)

Upper two-thirds of the anterior femoral shaft

Vastus intermedius (insertion)

Tibial tuberosity

Vastus intermedius (innervation)

Femoral nerve

Vastus intermedius (action)

Knee extension

Semitendinosus (origin)

Ischial tuberosity

Semitendinosus (insertion)

Proximal medial tibia via pes anserinus

Semitendinosus (innervation)

Tibial portion of the sciatic nerve

Semitendinosus (action)

Hip extension, knee flexion, and knee IR

Semimembranosus (origin)

Ischial tuberosity

Semimembranosus (insertion)

Posterior surface of the medial condyle of the tibia

Semimembranosus (innervation)

Tibial portion of the sciatic nerve

Semimembranosus (action)

Hip extension, knee flexion and knee IR

Biceps femoris long head (origin)

Ischial tuberosity

Biceps femoris long head (insertion)

Head of the fibula

Bicep femoris long head (innervation)

Tibial portion of the sciatic nerve

Bicep femoris long head (acion)

Hip extension, knee flexion, knee ER

Bicep femoris short head (orgin)

Lateral lip of linea aspera

Bicep femoris short head (insertion)

Head of fibula

Bicep femoris short head (innervation)

Peroneal portion of the sciatic nerve

Bicep femoris short head (action)

Knee flexion and knee ER

Gracilis (origin)

Inferior pubic ramus

Gracilis (insertion)

Proximal medial tibia via pes anserinus

Gracilis (innervation)

Obturator nerve

Gracilis (action)

Hip adduction, hip flexion, knee flexion, knee IR

Sartorius (origin)

Anterior superior iliac spine

Sartorius (insertion)

Proximal middle tibia via pes anserinus

Sartorius (innervation)

Femoral nerve

Sartorius (action)

Hip flexion, hip abduction, hip ER, knee flexion and knee IR

Popliteus (origin)

Posterior aspect of the lateral femoral condyle

Popliteus (insertion)

Posterior surface of the proximal tibia

Popliteus (innervation)

Tibial nerve

Popliteus (action)

Knee flexion and knee IR