Purvis, Thomas L. The Making of a Myth: Abraham Lincoln's Family Background in the Perspective of Jacksonian Politics.. Journal of the Illinois State Historical Society 75 (Summer 1982): 148-60.
The gluteal group of muscles consists of 3 muscles: Gluteus Maximus, Gluteus Medius and Gluteus Minimus. Gluteus is Greek for rump. Maximus is the largest of the muscles and Minimus the smallest. The role of the Gluteus maximus is different from the medius and minimus muscles because of their attachment points.
The biceps femoris, semitendinosus and semimembranosus make up the hamstring muscle group on the back of the thigh. These muscles work together to bend the knee of the leading leg while walking. The gluteal, or butt, muscles are located on the posterior hips. They include the gluteus maximus, gluteus medius and gluteus minimis. The gluteus maximus works with the hamstrings to extend the hip of the rear leg during a stride.