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We find, on the external surface of the iliac bone, the cotyloid cavity, whose border is interrupted by the cotyloid notch; a deep notch which looks downwards.

The cotyloid ligament being broader and thicker than usual, makes the osseous portion of the socket appear deeper than it really is.

The femeropelvic articulation is formed by the hemispherical head of the femur and the acetabulum; the latter constituting a cotyloid cavity which is deepened by the cotyloid ligament.

Immediately above the cotyloid cavity is a rough crest, which is known as the supracotyloid crest, which is, however, no other than the homologue of the sciatic spine.

The portion of the bone which connects the ilium to the region occupied by the cotyloid cavity is extremely narrow; posteriorly, the bone enlarges again to form the ischial and pubic portions.