InnerBody.com provides useful pictures, graphics and explanations of the human spinal cord. The site's popular interactive feature can be used to zoom, rotate and explore the pictures. Heathline.com provides additional pictures of the human spinal cord and other areas of human anatomy.
The spinal cord is the most important structure between the brain and the rest of the human body, according to Neuroscience Online. The average adult's spinal cord is between 40 and 50 centimeters long, and it is approximately 1 to 1.5 centimeters in diameter. The spinal cord is comprised of white and gray nervous tissue, and it receives blood from the anterior and posterior vertebral arteries.