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Vastus lateralis

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Thigh Muscles Study Sheet

The vastus lateralis is one of the four muscles that make up the quadriceps femoris group.

Anterior leg muscles: Tensor fascia latae, Sartorius, Rectus femoris, and Vastus lateralis.
Anterior leg muscles: Tensor fascia latae, Sartorius, Rectus femoris, and Vastus lateralis.

Vastus lateralis Origin

The vastus lateralis muscle originates from the lateral lip of the linea aspera. This is a ridge on the posterior surface of the femur. It also has origins from the greater trochanter and the intertrochanteric line of the femur.

Vastus lateralis Insertion

The vastus lateralis inserts into the quadriceps tendon, which then merges with the patella. From the patella, the quadriceps tendon continues as the patellar ligament. It attaches to the tibial tuberosity on the anterior surface of the tibia.

Vastus lateralis Actions

Knee Extension

Assistance in Hip Flexion

Stabilization of the Patella

Vastus Lateralis muscle anatomy, part of the quadriceps group extending the leg at the knee.
Vastus Lateralis muscle anatomy, part of the quadriceps group extending the leg at the knee.
Photography, text, and labels by Rob Swatski, Assistant Professor of Biology, Harrisburg Area Community College – York Campus, York, PA.
An anatomical model shows the quadriceps muscle group, with a focus on the vastus medialis. The vastus medialis muscle is shown in red, and an arrow points to its location on the lower part of the thigh, near the knee. The image shows that the vastus medialis extends the leg at the knee and is part of the quadriceps group. The visual layout emphasizes the structure and placement of the vastus medialis muscle within the thigh's muscular anatomy.
An anatomical model shows the quadriceps muscle group, with a focus on the vastus medialis.
Photography, text, and labels by Rob Swatski, Assistant Professor of Biology, Harrisburg Area Community College – York Campus, York, PA.

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