Cranium of man is made up of (in $bones$)

An elderly woman slipped in the bathroom and had severe pain in her lower back. After $X-ray$ examination,doctors told her it is due to a slipped disc. What does that mean? How does it affect our health?

The intervertebral disc is a:

The function of the skeleton in vertebrates is/are:

The formation of endochondral bone involves:

The vertebrarterial canal (foramen transversarium) is present in the vertebrae that are: