Knee Extensors - Quadriceps

Question 1

Rectus Femoris

Answer 1

Origin: Ant. inf. iliac spine (ASIS)
Insertion: Tibial tub. via patella
Action: Ext. of knee and flex. of hip

Question 2

Vastus Medialis

Answer 2

Origin: Med. surface of femur
Insertion: Tibial tub. via patella
Action: Ext. of knee, esp. in last 20 degrees of movement

Question 3

Vastus Lateralis

Answer 3

Origin: Upper lat. surface of femur
Insertion: Tibial tub. via patella
Action: Ext. of knee

Question 4

Vastus Intermedius

Answer 4

Origin: Ant. surface of femur
Insertion: Tibial tub. via patella
Action: Ext. of knee