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The pelvic girdle consists of two large bones of irregular shape, called the innominate bones.

The bony ring formed by                    sacrum and coccyx and innominate bones.

When fully ossified, the arch usually consists of three principal bones on each side, the ilium, ischium, and pubis, which are often closely united in the adult, forming the innominate bone.

In the innominate bones of a young child the box-shape exists, while its prominent abdomen resembles that of the gorilla.

The cup-shaped cavity of the innominate bone for receiving the head of the femur.