Buttock muscles. Computer artwork of a posterior oblique view of the hips showing some of the muscles (red) and muscle membranes (white) of the buttocks. The muscles shown here are the left and right obturator externus muscles. They are shown attached to the femurs (thigh bones) and the pelvis bones. The lower part of the spine is at upper right, ending in the sacrum and coccyx. This muscle also forms part of the medial compartment of the thigh. Like the obturator internis muscle, this muscle passes through the obturator foramen of the pelvis, seen in soft focus at lower right.
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