Pelvis bone

Generality

The bones of the pelvis, also known as pelvic bones, are four: the sacrum, the two iliac bones and the coccyx.

In relating to each other, the bones of the pelvis constitute a structure that anatomists define with the term pelvic girdle.
The pelvic girdle represents the connection between the so-called axial skeleton and the lower limb skeleton.
The sacrum and the coccyx are, respectively, the penultimate and the last tract of the vertebral column, therefore they reside posteriorly. The iliac bones, on the other hand, are the bony elements that develop laterally to the sacrum and give life to the hips and the pubic symphysis.
The bones of the pelvis have two fundamental functions: to support the weight of the upper part of the body and to connect the latter to the lower limbs.