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Pelvis is a region of the human body.
All reptiles, birds, and mammals have the same set of bones in their pelvis, although they may be arranged slightly differently. There are a total of three pairs of bones in the pelvis. These are the two illium, the two ischium, and the two pubis bones.
Each human has one pelvis.
pelvis
ilium
There are two. They are at the point where the femurs and the pelvis join.
The renal pelvis and renal calculi are not the same. The renal pelvis is a normal part of the body. Renal calculi are kidney stones and are not normal.
the pubis is found by the pelvis after the bufferfly
pelvis
The Pelvis has a complex shape and consist of a number of elements. See the related link for a labelled drawing of a human pelvis.
renal pelvis
pelvis