The spinal column is made up of many individual bony rings called vertebrae, joined together by muscles and ligaments. Flat, soft intervertebral discs separate and cushion each vertebra from the next.
Because the vertebrae are separate, the spine is flexible and can bend. Different regions of the spinal column have different names:
- The cervical vertebrae are those situated around the neck.
- The thoracic vertebrae are those situated in the chest region.
- The lumbar vertebrae, along with the sacrum, make up the lower back.
The spinal column houses the spinal cord, which consists of nerves that carry and receive signals to and from the arms, legs, and many internal organs.