One thing I love about the skeleton is that every part has a purpose, and if there isn't a part, if there is a hole (or foramen) then it is probably not there because it is not needed. Those holes in your pelvis, obturator foramina they are called, they are holes simply because there is no need for bone there. No muscles or tendons need to attach, they aren't protecting any vital organs... if there was bone there it would have nothing productive to do at all.
The rest of humans is not really like that.
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