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The Knee Joint
Muscle of the Knee Joint (Origins, Insertions, Actions, & Nerves)
| Question | Answer |
|---|---|
| Origin of Vastus Intermedius | Upper 2/3 of anterior surface of femur |
| Insertion of Vastus Intermedius | Upper border of patella & patella tendon to tibial tuberosity |
| Action of Vastus Intermedius | Extension of the knee |
| Innervation of Vastus Intermedius | Femoral nerve |
| Origin of Vastus Lateralis | Greater trochanter & linea aspera |
| Insertion of Vastus Lateralis | Lateral border of patella & patella tendon to tibial tuberosity |
| Action of Vastus Lateralis | Extension of knee |
| Innervation of Vastus Lateralis | Femoral nerve |
| Origin of Vastus medialis | Linea aspera & medial condyloid ridge |
| Insertion of Vastus medialis | Medial half of upper border of patella & patellar tendon to tibial tuberosity |
| Action of Vastus medialis | Extension of the knee |
| Innervation of Vastus medialis | Femoral nerve |
| Origin of Popliteus | Posterior surface of lateral condyle of femur |
| Insertion of Popliteus | Upper posterior medial surface of tibia |
| Action of Popliteus | Internal rotation of the knee as it flexes |
| Innervation of Popliteus | Tibial nerve |