part of part of Homo sapiens innominate bone zone of bone organ posterior gluteal line of ilium of os coxa 2026-03-19T00:00:00Z A zone of bone organ forming a curved ridge near the posterior margin of the gluteal surface of the ilium of the os coxa (innominate bone), extending from the iliac crest toward the greater sciatic notch and demarcating the small posterior area of origin of the gluteus maximus from the larger area of the gluteus medius. David Osumi-Sutherland