Anatomy of Pelvic Bone

The pelvic bone is a irregular ring-shaped structure which is composed of three separate bones but are fused, namely: ilium, ischium, and pubis. Its function is primarily for to weight bearing. The weight of the upper body, in sitting and standing position, transfers from the axial skeleton to the lower appendicular skeleton. The pelvic bone likewise provide attachments to several powerful muscles the thigh and abdomen which serves for locomotion and posture. The characteristic shape of the pelvis reflects the form of locomotion and body mass of humans which are bipedal, someone who walks with two legs. Wherein the iliac crests are parallel to the vertically oriented sacroiliac joints. While for animals who are quadrupedal, the bones are in parallel to the horizontally oriented sacroiliac joints.