ilium
A broad flat bone on either side of the pelvis.
Joined by the sacrum, the fused bones of
the base of the spine, it is fused with the ischium
and pubis in a triangular suture at the base
of the hip socket. The ilia form the back
of the "basin" of the pelvic girdle and anchor the muscles that form the
frontal wall of the abdomen.
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