There are 206 NAMED bones in a normal, complete, adult human skeleton.
However, individual people / skeletons can have more than 206 bones including various small UN_NAMED bones that have formed, typically in high-friction areas of the body e.g. Sesamoid bones in the palms of the hands and the soles of the feet or Sutural bones (tiny un-named bones found only within the sutural joints between cranial (skull) bones
..and the reason why some bones are not fused together at the time of birth is mainly to allow the child to pass through the birth canal. For instance, 26 bones of the head and face end up fusing as the child grows to form the skull – that’s why a skull has those ‘ziggy zaggy’ lines on it…
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