The neck is made up of the vertebrae, the spinal cord (the central nervous system extension from the brain), the intervertebral discs, and tissues such as muscles, ligaments, or ligaments. The spine protects the spinal cord. Intervertebral discs absorb shocks as cushions for the bones and provide nutrition to the joints. This allows us to bend our head and neck. A stiff neck is a stretching or tearing of muscles and ligaments. Tendons are bundles of tissue that hold muscles and bones together. A stiff neck is a common injury, especially during sports or sudden head-to-back jerks (whiplash).