The<unk><unk> <unk> ,<unk>  extensor, guads or quads) includes the four prevailing muscles on the front of the thigh. It is the great extensor muscle of the knee, forming a large fleshy mass which covers the front and sides of the femur.
It is subdivided into separate portions, which have received distinctive names.
Rectus<unk>  occupies the middle of the thigh, covering most of the other three<unk>  muscles. It originates on the ilium. It is named from its straight course.
The other three lie deep to rectus<unk>  and originate from the body of the femur, which they cover from the trochanters to the condyles:
Vastus lateralis is on the lateral side of the femur.
Vastus medialis is on the medial side of the femur.
Vastus intermedius lies between vastus lateralis and vastus medialis on the front of the femur.
Vastus lateralis is on the lateral side of the femur.
Vastus medialis is on the medial side of the femur.
Vastus intermedius lies between vastus lateralis and vastus medialis on the front of the femur.
All four parts of the<unk>  muscle attach to the patella via the<unk>  tendon.
The<unk>  is also involved in Lombard's Paradox.
Quadriceps femoris muscle
Sartorius muscle
Soleus muscle
Gluteus maximus muscle
Quadratus plantae muscle
Tibialis anterior muscle
Tibialis posterior muscle
Rectus femoris muscle