The pelvis is consists of four bones
1-two innominate bone.
2-sacrum
3-coccyx.
Innominate bone
The structure of the Innominate bone is also called hip bone or os coxae. It is a large irregular flat bone. It forms part of the pelvis. The two innominate bone forms front and side of the pelvis. Left and right pelvic bone connect at pubic symphysis in the anterior part of the pelvis and with sacrum in the posterior part of the pelvis. Each innominate bone composed of three parts ilium, ischium, and pubis (will discuss in next post).
Sacrum
Sacrum is fixed in the middle the right and left hip bones or Innominate bones. The sacrum is composed by the union of five sacral vertebrae. Sacrum bear all part of body weight.
Coccyx
The coccyx is also known as tail bone. It is a small triangular bone situated at the lowest point of the spine. It is formed by three to five coccygeal vertebrae. Or spinal bones.