What Single Backbone Called?

The vertebral column, also known as the backbone or spine, is part of the axial skeleton.

What is single vertebra?

It consists of a sequence of vertebrae (singular = vertebra), each of which is separated and united by an intervertebral disc. Together, the vertebrae and intervertebral discs form the vertebral column. It is a flexible column that supports the head, neck, and body and allows for their movements.

What is the last backbone called?

Below the sacrum is the tail end of your spine, called the coccyx or tailbone. Again, several fused vertebrae (generally 3–5) form the coccyx.