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For further information about spinal cord injury and the components of the nervous system, see:


Spinal Cord Injury: Hope Through Research - National Institute of Neurological Disorders and Stroke


The Life and Death of a Neuron - National Institute of Neurological Disorders and Stroke


Spinal Cord Injuries - MedLine Plus Health Information


Atlas of the Body: The Nervous System - American Medical Association       


Spinal Cord Disorders - Merck Manual Home Edition


Spinal Cord Injury Statistics


Home > Paralysis Support > What is Spinal Cord Injury? 




The spinal cord is the main pathway between the brain and the rest of the body.


Spinal cord injury (SCI) occurs when the spinal cord becomes damaged, most commonly, when motor vehicle accidents, falls, acts of violence, and sporting accidents fracture vertebrae and crush or transect the spinal cord.


Vertebrae are the rings of bones that surround the spinal cord and make up the spinal column (back bone). The vertebrae are named according to their location in the spinal column. There are seven cervical (neck), twelve thoracic (back), five lumbar and five sacral (lower back) vertebrae.


Cervical spinal cord injuries usually cause loss of function in both the arms and legs, resulting in tetraplegia.


Thoracic spinal cord injuries usually affect the chest and the legs; and lumbar and sacral injuries affect the hips and legs, resulting in paraplegia.


The nervous system is divided into two major systems:

  • •The central nervous system (CNS) consists of the brain and the spinal cord.


  • •The peripheral nervous system (PNS) is made up of all the other nerves that carry information to and from the muscles, organs and tissues of the body.


The spinal cord connects the brain to the PNS.



Damage to the spinal cord usually results in impairments or loss of:

  • Movement/Muscle Control

    • Inability to move muscles

    • Muscles may have spastic contractions or may atrophy from disuse


  • Sensation

    • Inability to feel hot/cold, pressure, pain, position sense

    • Inability to regulate body temperature


  • Organ System control

    • Loss of control of bowel/bladder

    • May need treatment to assist with SCI-related pain, sexual function and fertility

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