Muscles of the Knee Joint : Quadriceps Femoris Group

Question 1

What are the muscles of the quadriceps femoris group?

Answer 1

1. Rectus Femoris
2. Vastus Lateralis
3. Vastus Medialis
4. Vastus Intermedius

Question 2

What is the origin, insertion and actions of Rectus Femoris?

Answer 2

O : Anterior Inferior Iliac Spine
I : Tibial tuberosity via the patella and the patellar ligament
A :
1. Extends the leg at the knee joint
2. Flexes the thigh at the hip joint

Question 3

What is the origin, insertion and actions of Vastus Lateralis?

Answer 3

O : Linea Aspera of the femur
I : Tibial tuberosity via the patella and the patellar ligament
A : Extends the leg at the knee joint

Question 4

What is the origin, insertion and actions of Vastus Medialis?

Answer 4

O : Linea Aspera of the femur
I : Tibial tuberosity via the patella and the patellar ligament
A : Extends the leg at the knee joint

Question 5

What is the origin, insertion and actions of Vastus Intermedius?

Answer 5

O : Anterior shaft and Linea Aspera of the femur
I : Tibial Tuberosity via the patella and the patellar ligament
A : Extends the leg at the knee joint