Background of the study: Pterion is an H-shaped sutural convergence formed by frontal,parietal,temporal and sphenoid bones of the skull.Pterion is common site for the formation of accessory or epiteric bones which may be a pitfall when misinterpretated as fractures in radiological study.The sutural point formed by the junction of the parietal,temporal and occipital bones are called asterion.The asterion is a vital surgical landmark for the location of ending of transverse sinus and beginning of sigmoid sinus.These reasons motivated us to study the pterion and asterion in south indian population and note its variation. Aim of the study:To analyse the anatomical variations in the formation of pterion and asterion in south indian population. Materials and method:The present study was done in 150 dry human adult skulls from the bone bank of anatomy departments of Annapoorana medical college,Vinayaga missions kirupananda variyar medical college,Vinayaga missions homeopathy medical college,salem.The sutural pattern of the pterion in left and right sides of each skull bone was noted based on the descriptions by Murphy(sphenoparietal, frontotemporal, stellate and epipteric types).The asterion and its types:Type I when a sutural bone is present and type II where sutural bone is absent,was observed and recorded. Observation:Sphenoparietal type of sutural pattern was observed in 80%.Asterion type I was observed in 7.6%. Conclusion: Pterion pattern in south indian population revealed that sphenoparietal type(80%)of pterion is the most common presentation found regionally and internationally.11% of epiteric type of pterion was observed.Asterion type I (7.6%) was noted in this study.