What is a vertebral disc and how is it injured. Discs separate the vertebrae in the spine. Discs allow our spine to flex, and for us to bend over, turn, twist and move naturally. Discs have a hard stringy exterior of fibroid material that is designed to withstand forces and pressure when you jump, stand, sit or move. Inside the disc is a gelatinous material, like crab meat. The inside of the disc is soft to allow compression and movement, held together by the exterior fibroid material. A disc is therefore an integral component of the spine and gives you the ability to move, bend over and flex from your back.