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This muscle is situate at the posterior part of the pelvis, and at the upper and posterior part of the thigh. It is large, thick, and quadrilateral; and is attached, above, to the posterior part of the crista ilii, to the part of the ilium comprised between the crista and the upper curved line, to the posterior surface of the sacrum, coccyx, and great sacrosciatic ligament; and below, it terminates by a broad aponeurosis, which is inserted into the rugged surface that descends from the trochanter major to the linea aspera of the femur. This muscle extends the thigh on the pelvis, and rotates the thigh outwards. It is greatly concerned in station and progression.