Anterior Thigh Muscles

Question 1

Answer 1

Rectus Femoris

• O: Anterior (straight) head: from anterior inferior iliac spine (AIIS)
  
  • Posterior (reflected) head: from groove above rim of acetabulum
• I: tibial tuberosity (via common quadriceps tendon and patellar ligament) or the base of patella
• A: extension of knee and hip flexion
• N: femoral nerve L2- L4

Question 2

Answer 2

Vastus Lateralis

• O: lateral lip of linea aspera ( intertrochantric line, the gluteal tuberosity- inferior to greater trochanter)
• I: tibial tuberosity (via common quadriceps tendon and patellar ligament) or the base of patella
• A: knee extension
• N: femoral nerve L2 - L4

Question 3

Answer 3

Vastus Intermedius

• O: anterior and lateral surfaces of the body of femur
• I: tibial tuberosity ( via common quadriceps tendon) or base of patella
• A: knee extension
• N: femoral nerve L2 - L4

Question 4

Answer 4

Vastus Medialis

• O: medial lip of the linea aspera, and intertrochanteric line
• I: tibial tuberosity (via common quadriceps tendon) or base of patella
• A: knee extension
• N: femoral nerve L2 - L4