Ilium
The ilium is the uppermost bone of the pelvis and extends laterally.
This is a photo of an anatomical model of the ilium, the uppermost bone of the pelvis that extends laterally, with its major parts labeled as the iliac crest, acetabulum, ischium, and pubis.
Source
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"Ilium."
http://upload.wikimedia.org/wikipedia/commons/f/f2/Pelvis_diagram.png
Wikimedia
Public domain.
