Slipped disc is one of many nicknames that are associated with a spinal disc injury. Prior to being diagnosed by a medical doctor or chiropractor, most believe this pain is caused by a pinched nerve, but in actuality is caused by herniated disc. Although disc injuries generally create pinched nerves by way of compression. A severe enough disc injury can create low back pain, sciatica and in some cases weakness/numbness.
The lumbar spine is made up of a series of bones stacked on top of each other with a cushion between each vertebrae called a disc. The disc looks like a onion cut in half with the middle containing a space for liquid, like a jelly filled donut. The outer rings are very tough (fibrous) and known as the Annulus Fibrosis. The jelly filled center is known as the nucleus pulposus.
The purpose of a disc is to withstand compression and act a shock absorbing cushions.