Anterior Compartment of the Thigh

Question 1

What muscles are the flexors of the thigh?

Answer 1

• Pectineus
• Iliopsoas
• Sartorius

Question 2

What muscles are the extensors of the leg?

Answer 2

Quadriceps femoris (made up of four muscles) :
- Rectus femoris
- Vastus lateralis
- Vastus medialis
- Vastus intermedius

Question 3

What innervates the muscles which flex the thigh and extend the leg? What is the exception?

Answer 3

• All femoral nerve (L2, L3, L4)
• EXCEPT psoas major (L1, L2, L3)

Note : Flexors of thigh = pectineus, iliopsoas and sartorius, and extensors of leg = quadriceps femoris