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How the Spine Works
The spine helps the body
The Spinal Column
The spinal column is responsible for three main functions:
- To protect the spinal cord that runs through the centre
- To keep the body in an upright position
- To help the body move
It runs from the base of the skull to the pelvis, and is made up of 33 bones called vertebrae. Each vertebrae, apart from the top two, differs in shape and size but has the same anatomy. They are held together by muscles and ligaments, which provide the back with its flexibility, and are separated by cartilage disks to absorb shock. There are two joints attached to the back of each bone that increases the spine’s flexibility. At each level of the spine, a pair of nerves exits the spinal cord to send messages from the brain to and from various parts of the body.
From the front, the spinal column would appear as a straight line. While looking from the side, a fully-developed spine has an ‘S’ shape, with the neck and lower back curving slightly inwards and the upper back curving out. This is known as a non-degenerate spine, meaning it has not suffered from degeneration or deterioration.
The Spinal Cord
The spinal cord is a very important part of the body, acting as the foundation for the central nervous system by linking the brain to the rest of the body. Damage to the cord can have a devastating impact on a person’s ability to function properly.
Millions of nerve
It begins immediately below the brainstem and travels down to the first lumbar vertebrae (L1) for approximately 43cm. On its way down the back, 31 pairs of nerves, known as nerve roots, exit the spinal cord through holes in the vertebrae, branching out to various parts of the body. Where these nerves have control in the body depends on where they branch out of the spinal cord.
These nerves, the nerve cell clusters (ganglia) and the limb and organ connections form the peripheral nervous system (PNS), which is responsible for relaying electronic signals to and from the brain. Nerves that carry information from the brain to the body are called motor
The spinal cord ends at the conus medullaris before joining a mass of nerves at the base of the spine called the cauda equina.
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