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An attempt has been made to study and compare the incidence and variations in the pterion formation in the skulls of 40 Nigerians and 72 Indians obtained from the Department of Anatomy, University of Jos, Nigeria. The present study concludes: 1. All the three varieties of pterion i.e. sphenoparietal, frontotemporal and stellate are found in both races. 2. The frequency of sphenoparietal pterion is high in both races (Indians 95.3%, Nigerians 84.79%) while the frontotemporal (Indians 3.46%, Nigerians 10.11%) and the stellate (Indians 1.38%, Nigerians 5.06%) pterion are more common in Nigerians. 3. The frequency of epipteric bone is high in Indians (Indians 11.79%, Nigerians 3.79%) and is more commonly associated with sphenoparietal pterion. 4. No epipteric bone is associated with stellate pterion in both races. 5. The difference in the distance of pterion from the zygomatic arch is highly significant between two races on both sides. 6. The difference in the distance of pterion from the frontozygomatic suture is insignificant between the two races. 7. The frequency of "high Pterion" is more in Nigerians on both sides. 8. The frequency of "Backward Pterion" is more in Indians on the right side, whereas little more in Nigerians on the left side.
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