By operating on the bare back it is easier to locate the lower ribs and avoid the pelvis.

The hollow or concave side of the kidneys is turned inwards, and the deep fissure of this side, known as the hilus, widens out to form the pelvis.

This great arterial trunk now passes down in front of the spine to the pelvis, where it divides into two main branches, which supply the pelvis and the lower limbs.

She tilted her pelvis, pushed against his hand, and helped him to remove her warm underwear.