Art Anatomy

Vastus Lateralis

Pronuncation lat-er-AL-iss
Derivation The vast muscle on the lateral side of the thigh.
Origin Front surface on the upper end of the femur. The belly wraps around the lateral side of the femur and attaches to a long line on the back.
Insertion Patellar tendon.
Action Straightens the leg at the knee.

Vastus lateralis is a wide muscle. Its ends lie forward on the thigh, but its middle extends across most of the lateral side.

It lies under the whole of the iliotibial band, and a break may be seen at its forward edge.

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Next: Rectus Femoris

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