The spinal cord is the channel through which the brain connects with the body. After the brain sends signals, it sends them through the spinal nerves to all parts of the body, which govern the sensation and movement of the body’s limbs. The spinal cord is located in the vertebral canal, the upper end of which is connected to the medulla oblongata of the brain. Through the intervertebral foramina on both sides of the spinal canal, the spinal cord sends out paired bundles of nerves that are distributed to all parts of the body and the limbs to govern the sensation and muscle movement of the body’s limbs. The spinal cord reaches the level of the first lumbar vertebra and forms a spinal cord cone, which then forms a cauda equina-like bundle of nerves, called the cauda equina. The hot and cold pain felt in all parts of the body is expressed through the spinal cord to the brain. If the spinal cord is compressed or injured, symptoms such as limb paralysis, numbness, and difficulty in defecating will occur in the limbs below the level of injury.