| Sartorius *antagonist* | Origin: ASIS
Insertion: Medial Surface of Proximal Tibia
Action: Flexes and laterally rotates thigh at hip, flexes leg at knee
Innervation: Femoral Nerve |
| Rectus Femoris *prime mover* | Origin: AIIS
Insertion: Tibial Tuberosity (Patellar Tendon)
Action: Flexes thigh at hip, extends leg at the knee
Innervation: Femoral Nerve |
| Vastus Lateralis *synergist* | Origin: (Lateral Margin) Linea Aspera and Greater Trochanter
Insertion: Tibial Tuberosity (via patellar tendon)
Action: Extends leg at knee
Innervation: Femoral Nerve |
| Vastus Medialis | Origin: Medial Margin of Linea Aspera
Insertion: Tibial Tuberosity (via patellar Tendon)
Action: Extends leg at the knee
Innervation: Femoral Nerve |
| Vastus Intermedius | Origin: Anterior and lateral surfaces of the Femur
Insertion: Tibial Tuberosity (Patellar Tendon)
Action: Extends leg at the knee
Innervation: Femoral nerve |
| Tensor Vastus Intermedius (top of vastus Lateralis) | Origin: Between Intertrochanteric line and greater trochanter (of femur)
Insertion: Tibial Tuberosity (patellar tendon)
Action, extends leg at knee
Innervation: Femoral Nerve |
| Long head (Part of Biceps Femoris) | Origin: Ischial Tuberosity
Insertion: Head of Fibula
Action: Extend thigh at hip, flex leg at knee
Innervation: Sciatic Nerve |
| Short Head (Biceps Femoris) | Origin: Linea Aspera
Insertion: Head of Fibula
Action: Extend thigh at hip, flex leg at knee
Innervation: Sciatic Nerve |
| Semimembranosus | Origin: Ischial Tuberosity
Insertion: Posterior medial surface of medial Condyle (Tibia)
Action: Extend thigh at hip, flex leg at knee
Innervation: Sciatic Nerve |
| Semitendinosus | Origin: Ischial Tuberosity
Insertion: Medial Surface of proximal Tibia
Action: Extend thigh at hip, flex leg at knee
Innervation: Sciatic Nerve |
