The anterior compartment of the thigh contains several muscles that act on the knee joint. The quadriceps femoris group is made up of four muscles - the rectus femoris, vastus lateralis, vastus intermedius, and vastus medialis. Together they form the bulk of the thigh and act to extend the knee. All four muscles originate proximally and insert into the patella tendon distally. The femoral nerve innervates these muscles.

1. Muscles of Anterior
compartment of thig
h

4. • Quadriceps femoris
• Group of four muscles form main bulk of t
high and most powerful muscle of body.
• All muscles unite proximaly at knee and dista
ly attached to patella by patellar tendon
• All muscles Extend the knee joint and stastabi
lise the patella
• Femoral nerve

5. • Vastus letralis
• Greater trochanter and letral lip of lenea
aspera
• Vastus intermedius
• Anterior and letral surface of femoral shaft
• Vastus medialis
• Intertrochentric line and medial lip of linea a
spera

6. •Rectus femoris
• Ilium just superior to acetabulam
•It is only muscle that cro
ss hip as well as knee joi
nt.
• Flex at thigh and extend at knee

7. •Sartorius
• Longest muscle of body run inferiomedi
aly
• Anterior superior Iliac spine
• Anterior and medial surface of tibia
Flexor abductor and letral rotator at hi
p joint and flexor at knee joint.
Femoral nerve

8. Pectenius
Pectenial line on anterior surface o
f pelvis
Pectenial line on posterior surface
of femur
Adductor and flexor at hip joint.
Femoral nerve and may be obturat
or nerve.