The vastus lateralis is one of the four muscles that make up the quadriceps group, located on the front of the thigh. It is the largest of the quadriceps muscles and plays a crucial role in extending the knee joint. This muscle originates from the femur and inserts into the patellar tendon, which connects to the kneecap.
Functionally, the vastus lateralis helps in activities such as walking, running, and jumping by providing stability and strength to the knee. It is particularly important for movements that require powerful leg extension, making it essential for athletes and active individuals.