Anatomy
To understand why back problems can result from loss of the lordosis, let’s quickly focus on human anatomy.
The spine or “backbone” is made up of vertebrae. Each vertebra looks something like a spool of thread. It is circular and has a hole that runs from top to bottom. There are 33 vertebrae : seven in the neck (the cervical vertebrae), 12 in the upper back (the thoracic vertebrae), five in the lower back (the lumbar vertebrae), five fused together in the sacrum (the sacral vertebrae), and four rudimentary vertebrae fused together in the coccyx (the coccygeal vertebrae; these are the lowest part of the spine and are the vestige of a tail).
With the vertebrae lined up one atop the other, the holes form the spinal canal . Through this canal runs the bundle of nerves that extends from the head to the pelvis
