Muscles of Anterior thigh: EXTENSORS of Knee

Question 1

Rectus Femoris

Answer 1

O- 1. AIIS
     2. Ilium superior to acetabulum
I- Via Quadriceps tendon to base of patella
    Indirectly via patellar ligament to tibial tuberosity
N- Femoral L2, L3, L4
A- 1.  Extend leg at knee joint
    2.  Steadies hip joint
    3.  Helps iliopsoas flex thigh

Question 2

Vastus Lateralis

Answer 2

O- 1. Greater trochanter
2. Lateral lip of linea aspera
I- Via Quadriceps tendon to base of patella
Indirectly via patellar ligament to tibial tuberosity
To Tibia and patella via Lateral Patellar Retinacula
N- Femoral L2, L3, L4
A- Extend leg at knee joint

Question 3

Vastus Medialis

Answer 3

O- 1. Intertrochanteric line
2. Medial Lip of Linea Aspera
I- Via Quadriceps tendon to base of patella
Indirectly via patellar ligament to tibial tuberosity
To Tibia and Patella via Medial Patellar Retinacula
A- Extend leg at knee joint

Question 4

Vastus Intermedius

Answer 4

O- Anterior and lateral surfaces of shaft of femur
I- Via Quadriceps tendon to base of patella
Indirectly via patellar ligament to tibial tuberosity
N- Femoral L2 L3 L4
A- Extend leg at knee joint