<P> Individuals may have more or fewer bones than the average (even accounting for developmental stage) owing to anatomical variations . The most common variations include sutural (wormian) bones, which are located along the sutural lines on the back of the skull, and sesamoid bones which develop within some tendons, mainly in the hands and feet . Some individuals may also have additional (i.e., supernumerary) cervical ribs or lumbar vertebrae . </P> <P> A fully grown adult features 26 bones in the spine, whereas a child can have 34 . </P> <Ul> <Li> Cervical vertebrae (set of 7 bones) </Li> <Li> Thoracic vertebrae (set of 12 bones) </Li> <Li> Lumbar vertebrae (set of 5 bones) </Li> <Li> Sacral vertebrae (set of 5 bones at birth, and later fused into one) </Li> <Li> Coccygeal vertebrae (set of 5 bones at birth; some or all 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> </Ul> <Li> Cervical vertebrae (set of 7 bones) </Li>

Who named all the bones in the human body