behind its anterior extremity, and, taking a curved direction downward and backward, ends at the upper part of the greater sciatic notch.

The space between the anterior and posterior gluteal lines and the crest is concave, and gives origin to the gluteus medius muscle.

Behind this line is a narrow semilunar surface, the upper part of which is rough and gives origin to a portion of the gluteus maximus muscle.

The gluteus minimus is a fan-shaped convergent muscle, arising from the outer surface of the ilium, between the anterior and inferior gluteal lines, and behind, from the margin of the greater sciatic notch.

The gluteus maximus arises from the posterior gluteal line of the inner upper ilium, and the rough portion of bone including the crest, immediately above and behind it; from the posterior surface of the lower part of the sacrum and the side of the coccyx; from the aponeurosis of the erector spinae (lumbodorsal fascia), the sacrotuberous ligament, and the fascia covering the gluteus medius.