The growth rate of the human cranial base between nasion and inion

Abstract
The growth rate of the human cranial base between nasion (N)-tuberculum sellae (Ts) and tuberculum sellae-internal occipital protuberance (=Twining's line (Tw)) were calculated in proportion to nasion-inion (N-I) distance and expressed in two cranial base ratios:\(\frac{{N - Ts}}{{N - I}}\) and\(\frac{{Tw}}{{N - I}}\) The growth rate of the whole cranial base showed a notable stability and a given ratio apparently prevails through into later life.