Which term designates the wedge-shaped bone that unites the pelvic bones?

Which term designates the wedge-shaped bone that unites the pelvic bones?

• A. Sacrum
• B. Lumbar
• C. Coccyx
• D. Thoracic

Answer: (A)

The sacrum is the wedge-shaped bone that unites the pelvic bones. It sits at the base of the spine and forms the posterior part of the pelvis, created by the fusion of five sacral vertebrae. It articulates with the ilia at the sacroiliac joints, acting as a keystone that anchors the two hip bones together and helps transfer weight from the upper body to the pelvis. The other terms refer to different parts of the vertebral column: the lumbar region is the lower back, the coccyx is the tailbone, and the thoracic region corresponds to the mid-back with the ribs.

The sacrum is the wedge-shaped bone that unites the pelvic bones. It sits at the base of the spine and forms the posterior part of the pelvis, created by the fusion of five sacral vertebrae. It articulates with the ilia at the sacroiliac joints, acting as a keystone that anchors the two hip bones together and helps transfer weight from the upper body to the pelvis. The other terms refer to different parts of the vertebral column: the lumbar region is the lower back, the coccyx is the tailbone, and the thoracic region corresponds to the mid-back with the ribs.