The sacrum is a complex structure providing support for the spine and accommodation for the spinal nerves. It also articulates with the hip bones. The sacrum has a base, an apex, and three surfaces – a pelvic, dorsal a… 展开

The congenital disorder, spina bifida, occurs as a result of a defective embryonic neural tube, characterised by the incomplete closure of vertebral arch or of the incomplete closure of the surface of the vertebral canal. … 展开

In dogs, the sacrum is formed by three fused vertebrae. The sacrum in the horse is made up of five fused vertebrae. In birds, the sacral vertebrae are fused with the lumbar and some caudal and thoracic vertebrae to for… 展开