vertebra - one of the bony segments of the spinal columnbone, os - rigid connective tissue that makes up the skeleton of vertebrates centrum - the main body of a vertebra apophysis - (anatomy) a natural outgrowth or projection on an organ or part such as the process of a vertebra transverse process - one of two processes that extend from each vertebra and provide the point of articulation for the ribs dorsal vertebra, thoracic vertebra - one of 12 vertebrae in the human vertebral column; thoracic vertebrae extend from the seventh cervical vertebra down to the first lumbar vertebra lumbar vertebra - one of 5 vertebrae in the human vertebral column; lumbar vertebrae extend from the twelfth thoracic vertebra down to the sacral vertebrae sacral vertebra - one of 5 vertebrae in the human spine that fuse in the adult to form the sacrum |