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Address for Correspondence: Dr. K Ephraim Vikram Rao, Assistant Professor, Department of Anatomy, Deccan College of Medical Sciences, Santhosh Nagar, Hyderabad,500058, Telangana, India. Mobile Number: 09949353025 E-Mail: drvikram.anat@gmail.com, dr.ephraimvikram@gmail.com Introduction: Pterional approach is a minimally invasive procedure to reach the anterior and middle cranial fossae. Location of the pterion was observed to be race specific, which could be due to genetic or environmental factors affecting the craniometric indices of human skull. The present study aimed to find out the incidence of various sutural patterns of pterion and also to determine the location of pterion which would be of immense benefit while performing pterional approaches in micro neuro surgical procedures on south Indians. Materials and Methods: The present study was carried out on 140 pterions of 70 dry human adult skulls of unknown sex. The sutural pattern of the pterion was determined on both sides of each skull, based on Murphy’s classification. Measurements were taken from the center of pterion to mid point on zygomatic suture, posterolateral aspect of frontozygomatic suture, anterosuperior margin of external auditory meatus and inferior margin of mastoid process. Results: The incidence of sphenoparietal pattern was predominant with 77.5%, frontotemporal type was 4.16 %, stellate type was 5.83 % and epipteric type was observed to be 12.5%. The average distance from the center of pterion to mid point on zygomatic arch was 37.40±3.92 mm, from the center of pterion to posterolateral aspect of frontozygomatic suture was 30.43±4.36 mm, from the center of pterion to anterosuperior margin of external auditory meatus was 51.67±3.96 mm, from the center of pterion to inferior aspect of mastoid process was 80.04±6.22 mm. There were no significant side variations in the distance from the midpoint of pterion to all the four anatomical landmarks. Conclusion: The location of pterion and the variations in the sutural patterns of pterion plays an important role while performing pterional approaches in neurosurgical procedures on south Indians.

MORPHOLOGY AND MORPHOMETRIC ANALYSIS OF PTERION WITH ITS NEUROSURGICAL IMPLICATIONS IN PTERIONAL APPROACH