Which of the following does NOT make up the gluteus muscle group?

The gluteus muscle group consists of three primary muscles: the gluteus maximus, gluteus medius, and gluteus minimus. Each of these has a specific role in movement and stability.

The gluteus maximus is the largest muscle in the group and is responsible for the movement of the hip and thigh. The gluteus medius lies underneath the gluteus maximus and plays a key role in hip stabilization and abduction of the thigh. The gluteus minimus is located beneath the gluteus medius, and its functions also include aiding in hip abduction and stabilization.

The term "Masterous" does not correspond to any recognized muscle within the gluteus group or the human anatomy. Thus, it stands out as the option that does not belong to the gluteus muscle group, confirming that the other three options are indeed valid components of this muscle group.