<Li> The thoracic vertebrae (12) </Li> <Li> The lumbar vertebrae (5) </Li> <Li> The sacral vertebrae (5 at birth, later fused into one) </Li> <Li> 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.) </Li>

How many bones are in your arms and legs