bakbeinskeðjan
Bakbeinskeðjan, often translated as the "bone chain" or "backbone chain," refers to the sequence of interconnected bones that form the vertebral column in many animals. This structure provides support, protection for the spinal cord, and allows for a range of movement. In mammals, the bakbeinskeðjan is typically divided into distinct regions, including the cervical (neck), thoracic (chest), lumbar (lower back), sacral (pelvic), and caudal (tail) vertebrae. The number of vertebrae in each region can vary significantly between species, reflecting adaptations to different lifestyles and environments.
The individual bones, or vertebrae, are usually complex structures that articulate with each other via facet