The vastus medialis is one of the four muscles that make up the quadriceps group, located in the front of the thigh. It plays a crucial role in extending the knee and stabilizing the patella, or kneecap, during movement. This muscle is particularly important for activities such as walking, running, and jumping. Anatomically, the vastus medialis is situated on the inner side of the thigh and is often referred to as the "teardrop" muscle due to its shape. It originates from the femur and inserts into the patellar tendon, which connects to the tibia. Strengthening the vastus medialis can help improve knee stability and overall leg function, making it significant for athletes and individuals recovering from knee injuries.