Medically reviewed by Jennifer Steinhoff, MDThe lumbar spine includes the five vertebrae in your lower back numbered L1 to L5 ...

The lumbosacral joint, also called L5-S1, is a term used to describe a part of the spine. L5-S1 is the exact spot where the lumbar spine ends and the sacral spine begins. The lumbosacral joint ...

Diagram. There are 7 cervical vertebrae in the cervical region. There are 12 thoracic vertebrae in the thoracic region. There are 5 lumbar vertebrae in the lumbar region. There are 5 sacral vertebrae, ...