The cervical vertebrae (7) The thoracic vertebrae (12) The lumbar vertebrae (5) Additional lumbar vertebrae The sacral vertebrae (5 at birth, later fused into one) The coccygeal vertebrae (5 at birth, some or all of the bones fuse together but there seems to be a disagreement between researchers as to what the most common number should be. Some say the most common is 1, others say 2 or 3, with 4 being the least likely. It is counted as 1 in this article.)