Unless you have a twin growing inside you, you only have one spinal cord. The spine however, is made up of many vertebrae. You have seven cervical, twelve thoracic, and five lumbar.
There are four natural curvatures of the spine.
There is just one. It consists of the brain and spinal cord.
There are two main enlargements in the spinal cord, the Cervical enlargement, and an enlargement at the Conus Medullaris in the Thorasic section of the spinal cord.
In human anatomy, the vertebral column (backbone or spine) is a column of 24 vertebrae, the sacrum, intervertebral discs, and the coccyx situated in the dorsal aspect of the torso, separated by spinal discs. It houses the spinal cord in its spinal canal.
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There are many, many, many different factors that can cause disabilities. For instance, if your spinal cord was damaged, you may be paralyzed from the waist down or head down, depending on where you were hit on the spinal cord. Your spinal cord sends messages to your nerves in your body, and thus cannot if broken.
In an adult the lower end of the spinal cord usually ends at approximately the first lumbar vertebra, where it divides into many individual nerve roots (L1). That is the reason Lumbar Puncture usually perform at L3-L4 in order to prevent accidentally injure to the spinal cord. The point where the spinal cord ends is referred to as the "conus medullaris"
According to The University of Alabama's National Spinal Cord Injury Statistical Center (NSCISC), which compiles the data, approximately 11,000 spinal cord injuries (SCIs) occur each year