Sutural growth.

As the skull develops, the tissue of the coronal and sagittal sutures (serrated sutures) assumes a specific structure which in part is practically identical to that of a gomphosis joint and may therefore be regarded as a 'multigomphosis'. The nature of this structure justifies the assumption that it has to resist mechanical forces exerted on the suture. The results of transplantation experiments with portions of sutures suggest that the sutural structures are determined hereditarily, but that environmental factors are required for these qualities to manifest themselves.