how many disc are in your back?
The human spine consists of 33 vertebrae, 23 discs, 31 pairs of nerves, and 140 muscles, as well as tendons, ligaments, and cartilage. The discs act as a cushion between the vertebrae (the bony segments of the spine) and are comprised of protein, cartilage, and water. There are 6 in the cervical region (neck), 12 in the thoracic region (middle back), and 5 in the lumbar region (lower back).
Updated on Thursday, February 02 2012 at 01:36AM EST