Final answer:
The sartorius muscle is an anterior femur muscle that is not part of the quadriceps, which functions in hip and knee movements.
Step-by-step explanation:
An anterior femur muscle that is not a part of the quadriceps is the sartorius muscle. The function of the quadriceps femoris muscle is to extend the leg at the knee joint and to flex the thigh at the hip joint. While the quadriceps femoris group includes the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius, all of which work to extend the knee, the sartorius is a long, thin, band-like muscle that originates at the anterior superior iliac spine and extends down to the medial side of the proximal tibia. The sartorius muscle is known for its ability to flex, abduct, and laterally rotate the leg at the hip as well as flex the leg at the knee, contributing to the ability to sit cross-legged, among other actions.