Discs are the cushions between the vertebrae in the spine. They are made up of cartilage – soft cartilage on the inside with an outer layer of tough cartilage. The 23 vertebral discs in the back have three main roles: to act as a shock absorber, to allow for spinal mobility, and to act as ligaments … [Read more...] about What’s the Difference Between a Herniated Disc and Bulging Disc