Vastus lateralis muscle

A muscle in the thigh

Illustration of lower extremity muscles, including the vastus lateralis

Location of the vastus lateralis muscle

Cross-section of the thigh showing the vastus lateralis

Vastus lateralis muscle

The vastus lateralis muscle is one of the four quadriceps femoris muscles, located in the thigh. It is the largest and most powerful part of the quadriceps group, which also includes the vastus medialis, vastus intermedius, and rectus femoris.

Anatomy

The vastus lateralis originates from the greater trochanter and the lateral lip of the linea aspera of the femur. It extends down the lateral side of the thigh and inserts into the patella via the quadriceps tendon. The muscle fibers are oriented in a slightly oblique direction, which contributes to its powerful extension capability.

Function

The primary function of the vastus lateralis is to extend the knee joint. It plays a crucial role in activities such as walking, running, and jumping. By extending the knee, it helps stabilize the leg and supports the body's weight during movement.

Innervation

The vastus lateralis is innervated by the femoral nerve, which arises from the lumbar plexus. The nerve fibers that supply the vastus lateralis originate from the L2, L3, and L4 spinal nerves.

Blood Supply

The blood supply to the vastus lateralis is primarily provided by the lateral circumflex femoral artery, a branch of the deep femoral artery.

Clinical Significance

Injuries to the vastus lateralis can occur due to overuse or trauma, leading to conditions such as muscle strains or tears. Rehabilitation often involves rest, physical therapy, and strengthening exercises to restore function.

Related pages

• Quadriceps femoris muscle
• Femoral nerve
• Knee joint

References

• Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2013). Clinically Oriented Anatomy. Lippincott Williams & Wilkins.
• Standring, S. (2015). Gray's Anatomy: The Anatomical Basis of Clinical Practice. Elsevier Health Sciences.